Manifest V3 migration guide | Firefox Extension Workshop

<!DOCTYPE html> <html lang="en"><head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1"> <title>Manifest V3 migration guide | Firefox Extension Workshop</title> <link rel="preload" href="/assets/fonts/icomoon/fonts/icomoon.e09c8480.woff2"> <link rel="preload" href="/assets/fonts/inter/Inter-Regular.4a249737.woff2"> <link rel="preload" href="/assets/fonts/inter/Inter-SemiBold.8aece91e.woff2"><link rel="preconnect" href="https://www.googletagmanager.com"> <link rel="preconnect" href="https://s.ytimg.com"> <link rel="canonical" href="https://extensionworkshop.com/documentation/develop/manifest-v3-migration-guide/"> <meta name="description" content="Get help creating & publishing Firefox extensions."> <meta property="og:description" content="Get help creating & publishing Firefox extensions."> <meta property="og:locale" content="en_US"> <meta property="og:site_name" content="Firefox Extension 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reference</a><ul class="section"> <li><a href="#whats-new">What's new</a></li> <li><a href="#commands">Commands</a></li> <li><a href="#web-ext-build"><code>web-ext build</code></a></li> <li><a href="#web-ext-docs"><code>web-ext docs</code></a></li> <li><a href="#web-ext-dump-config"><code>web-ext dump-config</code></a></li> <li><a href="#web-ext-lint"><code>web-ext lint</code></a></li> <li><a href="#web-ext-run"><code>web-ext run</code></a></li> <li><a href="#web-ext-sign"><code>web-ext sign</code></a></li> <li><a href="#global-options">Global options</a></li> <li><a href="#setting-option-environment-variables">Setting option environment variables</a></li> <li><a href="#see-also">See also</a></li> </ul> </li> <li> <a href="/documentation/develop/web-ext-command-reference-v7/">web-ext v7 command reference</a><ul class="section"> <li><a href="#commands">Commands</a></li> <li><a href="#global-options">Global options</a></li> <li><a href="#setting-option-environment-variables">Setting option environment variables</a></li> <li><a href="#see-also">See also</a></li> </ul> </li> <li> <a href="https://github.com/hiikezoe/web-ext-webpack-plugin/blob/master/README.md">Web-ext Webpack plug-in</a> </li> <li> <a href="https://github.com/mozilla/webextension-polyfill">Browser API Polyfill</a> </li> <li> <a href="/documentation/develop/extensions-and-the-add-on-id/">Extensions and the Add-on ID</a><ul class="section"> <li><a href="#basic-workflow-with-no-add-on-id">Basic workflow with no add-on ID</a></li> <li><a href="#when-do-you-need-an-add-on-id">When do you need an add-on ID?</a></li> </ul> </li> </ul> </div> <div class="category"> <h6>User Experience</h6> <ul> <li> <a href="/documentation/develop/build-a-secure-extension/">Build a secure extension</a> </li> <li> <a href="/documentation/develop/request-the-right-permissions/">Request the right permissions</a><ul class="section"> <li><a href="#introduction">Introduction</a></li> <li><a href="#advised-permissions">Advised permissions</a></li> <li><a href="#avoid-unnecessary-permissions">Avoid unnecessary permissions</a></li> <li><a href="#request-permissions-at-runtime">Request permissions at runtime</a></li> <li><a href="#add-information-about-permissions-to-your-extensions-amo-page">Add information about permissions to your extensions AMO page</a></li> </ul> </li> <li> <a href="/documentation/develop/best-practices-for-collecting-user-data-consents/">Best practices for collecting user data consents</a><ul class="section"> <li><a href="#know-your-privacy-settings">Know your privacy settings</a></li> <li><a href="#get-prepared">Get prepared</a></li> <li><a href="#create-a-privacy-policy">Create a privacy policy</a></li> <li><a href="#prompt-after-install">Prompt after install</a></li> <li><a href="#determine-your-consent-flow">Determine your consent flow</a></li> <li><a href="#your-consent-dialogs">Your consent dialogs</a></li> </ul> </li> <li> <a href="/documentation/develop/build-an-accessible-extension/">Build an accessible extension</a> </li> <li> <a href="/documentation/develop/onboard-upboard-offboard-users/">Onboard, upboard, offboard users</a><ul class="section"> <li><a href="#onboarding">Onboarding</a></li> <li><a href="#upboarding">Upboarding</a></li> <li><a href="#offboarding">Offboarding</a></li> </ul> </li> <li> <a href="/documentation/develop/user-experience-best-practices/">User experience best practices</a><ul class="section"> <li><a href="#keep-it-focused">1. Keep it focused</a></li> <li><a href="#give-users-what-they-need-where-they-need-it">2. Give users what they need, where they need it</a></li> <li><a href="#keep-the-user-informed">3. Keep the user informed</a></li> <li><a href="#be-firefoxy-in-look-and-feel">4. Be Firefoxy in look and feel</a></li> <li><a href="#great-onboarding-experience">5. Great onboarding experience</a></li> <li><a href="#test-test-and-then-test-again">6. Test, test, and then test again</a></li> </ul> </li> </ul> </div> <div class="category"> <h6>Mobile</h6> <ul> <li> <a href="/documentation/develop/differences-between-desktop-and-android-extensions/">Differences between desktop and Android extensions</a><ul class="section"> <li><a href="#introduction">Introduction</a></li> <li><a href="#user-interface">User interface</a></li> <li><a href="#native-application-interaction">Native application interaction</a></li> <li><a href="#permissions">Permissions</a></li> <li><a href="#storage">Storage</a></li> </ul> </li> <li> <a href="/documentation/develop/user-experience-guidelines-for-mobile-extensions/">User experience guidelines for mobile extensions</a><ul class="section"> <li><a href="#introduction">Introduction</a></li> <li><a href="#the-basics">The basics</a></li> <li><a href="#the-extra-mile">The extra mile</a></li> <li><a href="#the-last-mile">The last mile</a></li> </ul> </li> <li> <a href="/documentation/develop/developing-extensions-for-firefox-for-android/">Developing extensions for Firefox for Android</a><ul class="section"> <li><a href="#set-up-your-computer-and-android-emulator-or-device">Set up your computer and Android emulator or device</a></li> <li><a href="#check-for-firefox-for-android-compatibility">Check for Firefox for Android compatibility</a></li> <li><a href="#install-and-run-your-extension-in-firefox-for-android">Install and run your extension in Firefox for Android</a></li> <li><a href="#debug-your-extension">Debug your extension</a></li> <li><a href="#mv3-compatibility">Manifest V3 compatibility</a></li> </ul> </li> <li> <a href="https://github.com/mozilla/geckoview">GeckoView Extensions (Android library)</a> </li> </ul> </div> <div class="category"> <h6>Port Your Extension</h6> <ul> <li> <a href="/documentation/develop/porting-a-google-chrome-extension/">Porting a Google Chrome Extension</a> </li> </ul> </div> <div class="category"> <h6>Debug and Test</h6> <ul> <li> <a href="/documentation/develop/debugging/">Debugging</a><ul class="section"> <li><a href="#developer-tools-toolbox">Developer tools toolbox</a></li> <li><a href="#debugging-background-scripts">Debugging background scripts</a></li> <li><a href="#debugging-options-pages">Debugging options pages</a></li> <li><a href="#debugging-popups">Debugging popups</a></li> <li><a href="#debugging-content-scripts">Debugging content scripts</a></li> <li><a href="#debugging-sidebars">Debugging sidebars</a></li> <li><a href="#debugging-storage">Debugging storage</a></li> <li><a href="#debugging-developer-tools-pages-and-panels">Debugging developer tools pages and panels</a></li> <li><a href="#debug-permission-requests">Debug permission requests</a></li> <li><a href="#debugging-browser-restarts">Debugging browser restarts</a></li> </ul> </li> <li> <a href="/documentation/develop/temporary-installation-in-firefox/">Temporary Installation in Firefox</a><ul class="section"> <li><a href="#reloading-a-temporary-extension">Reloading a temporary extension</a></li> <li><a href="#using-the-command-line">Using the command line</a></li> <li><a href="#detecting-temporary-installation">Detecting temporary installation</a></li> <li><a href="#limitations">Limitations</a></li> </ul> </li> <li> <a href="/documentation/develop/testing-persistent-and-restart-features/">Testing persistent and restart features</a><ul class="section"> <li><a href="#what-is-an-add-on-id">What is an add-on ID?</a></li> <li><a href="#what-is-a-firefox-profile">What is a Firefox profile?</a></li> <li><a href="#extension-behavior-in-firefox">Extension behavior in Firefox</a></li> <li><a href="#what-do-i-do-to-ensure-i-can-test-my-extension">What do I do to ensure I can test my extension?</a></li> </ul> </li> <li> <a href="/documentation/develop/test-permission-requests/">Test permission requests</a><ul class="section"> <li><a href="#permission-grant-behavior-during-testing">Permission grant behavior during testing</a></li> <li><a href="#observe-or-verify-install-time-permission-requests">Observe or verify install time permission requests</a></li> <li><a href="#retest-runtime-permission-grants">Retest runtime permission grants</a></li> </ul> </li> <li> <a href="/documentation/develop/known-issues/">Known issues</a><ul class="section"> <li><a href="#invisible-content-scripts">Content scripts don't appear in DevTools</a></li> <li><a href="#devtools-updates-missing">Extension source don't update in DevTools</a></li> <li><a href="#android-destroyed-actor">"Destroyed actor" errors when debugging Android</a></li> </ul> </li> </ul> </div> </li> <li class="has-children"> <a href="/documentation/publish/" data-overviewtitle="Publish Overview">Publish</a> <ul class="section"> <li><a href="#get-your-extension-signed">Get your extension signed</a></li> <li><a href="#distribute-your-signed-extension">Distribute your signed extension</a></li> <li><a href="#promote-your-extension">Promote your extension</a></li> </ul> <div class="category"> <h6>Policies</h6> <ul> <li> <a href="/documentation/publish/add-on-policies/">Add-on Policies</a><ul class="section"> <li><a href="#no-surprises">No Surprises</a></li> <li><a href="#content">Content</a></li> <li><a href="#submission-guidelines">Submission Guidelines</a></li> <li><a href="#development-practices">Development Practices</a></li> <li><a href="#data-disclosure-collection-and-management">Data Disclosure, Collection and Management</a></li> <li><a href="#monetization">Monetization</a></li> <li><a href="#security-compliance-and-blocking">Security, Compliance and Blocking</a></li> </ul> </li> <li> <a href="/documentation/publish/firefox-add-on-distribution-agreement/">Firefox Add-on Distribution Agreement</a><ul class="section"> <li><a href="#introduction">1. Introduction</a></li> <li><a href="#accounts">2. Accounts</a></li> <li><a href="#privacy-policy">3. Privacy Policy</a></li> <li><a href="#distribution-certificates-and-review-process">4. Distribution, certificates, & review process</a></li> <li><a href="#your-obligations">5. Your obligations</a></li> <li><a href="#licenses-proprietary-rights">6. Licenses; proprietary rights</a></li> <li><a href="#content-removal">7. Content removal</a></li> <li><a href="#disclaimer-of-warranties">8. Disclaimer of warranties</a></li> <li><a href="#limitation-of-liability">9. Limitation of liability</a></li> <li><a href="#release-idemnification">10. Release; indemnification</a></li> <li><a href="#general-legal-terms">11. General legal terms</a></li> </ul> </li> <li> <a href="/documentation/publish/add-ons-blocking-process/">Add-ons Blocking Process</a><ul class="section"> <li><a href="#security-over-choice">Security Over Choice</a></li> <li><a href="#blocking-criteria">Blocking Criteria</a></li> <li><a href="#developer-outreach">Developer Outreach</a></li> <li><a href="#requesting-a-block">Requesting a Block</a></li> <li><a href="#blocking-other-types-of-third-party-software">Blocking Other Types of Third Party Software</a></li> </ul> </li> <li> <a href="/documentation/publish/third-party-library-usage/">Third Party Library Usage</a><ul class="section"> <li><a href="#when-must-links-for-third-party-libraries-be-provided">When must links for third-party libraries be provided?</a></li> <li><a href="#how-to-determine-the-third-party-library-link">How to determine the third-party library link</a></li> <li><a href="#communicating-third-party-library-links-to-the-reviewer">Communicating third-party library links to reviewers</a></li> </ul> </li> <li> <a href="/documentation/publish/what-does-review-rejection-mean-to-users/">What does review rejection mean to users?</a><ul class="section"> <li><a href="#review-overview">Review overview</a></li> <li><a href="#impact-of-review-rejection">Impact of review rejection</a></li> <li><a href="#blocklisting">Blocklisting</a></li> </ul> </li> </ul> </div> <div class="category"> <h6>Sign</h6> <ul> <li> <a href="/documentation/publish/signing-and-distribution-overview/">Signing and distribution overview</a><ul class="section"> <li><a href="#signing-your-addons">Signing your add-ons</a></li> <li><a href="#distributing-your-addon">Distributing your add-on</a></li> <li><a href="#post-submission-review">Post-submission review</a></li> <li><a href="#about-amo">More information about AMO</a></li> </ul> </li> <li> <a href="/documentation/publish/package-your-extension/">Package your extension</a><ul class="section"> <li><a href="#package-windows">Windows</a></li> <li><a href="#package-mac">Mac OSX</a></li> <li><a href="#package-linux">Linux / Mac OSX Terminal</a></li> </ul> </li> </ul> </div> <div class="category"> <h6>Distribute</h6> <ul> <li> <a href="/documentation/publish/distribute-manifest-versions/">Distribute Manifest V2 and V3 extensions</a> </li> <li> <a href="/documentation/publish/distribute-pre-release-versions/">Distribute pre-release versions</a> </li> <li> <a href="/documentation/publish/submitting-an-add-on/">Submitting an add-on</a><ul class="section"> <li><a href="#listing-on-amo">Listing on AMO</a></li> <li><a href="#self-distribution">Self-distribution</a></li> <li><a href="#get-help">Get help</a></li> </ul> </li> <li> <a href="/documentation/publish/source-code-submission/">Source code submission</a><ul class="section"> <li><a href="#provide-your-extension-source-code">Provide your extension source code</a></li> <li><a href="#default-reviewer-build-environment">Default reviewer build environment</a></li> <li><a href="#use-of-obfuscated-code">Use of obfuscated code</a></li> <li><a href="#source-code-checklist">Source code checklist</a></li> </ul> </li> <li> <a href="/documentation/publish/version-compatibility/">Firefox version compatibility</a><ul class="section"> <li><a href="#compatibility">Version compatibility</a></li> <li><a href="#browser-specific-settings">The `browser_specific_settings` key</a></li> <li><a href="#amo-compatibility">AMO compatibility setting</a></li> <li><a href="#recommendations">Recommendations</a></li> </ul> </li> <li> <a href="/documentation/publish/add-on-ownership/">Add-on ownership</a><ul class="section"> <li><a href="#transfer-ownership">Transfer ownership</a></li> <li><a href="#code-disputes">Code disputes</a></li> </ul> </li> <li> <a href="/documentation/publish/developer-accounts/">Developer accounts</a><ul class="section"> <li><a href="#setting-a-display-name">Setting a display name</a></li> <li><a href="#blocked-accounts">Blocked accounts</a></li> <li><a href="#email-issues">Issues receiving emails from AMO</a></li> </ul> </li> <li> <a href="/documentation/publish/self-distribution/">Self-distribution</a><ul class="section"> <li><a href="#options">Self-distribution options</a></li> </ul> </li> <li> <a href="/documentation/publish/distribute-sideloading/">Sideloading</a><ul class="section"> <li><a href="#preparing-your-addon">Preparing your add-on</a></li> <li><a href="#install-addon-from-file">Install add-on from file</a></li> <li><a href="#standard-extension-folders">Installation using the standard extension folders</a></li> </ul> </li> <li> <a href="/documentation/publish/distribute-for-desktop-apps/">For desktop apps</a> </li> </ul> </div> <div class="category"> <h6>Promote</h6> <ul> <li> <a href="/documentation/develop/create-an-appealing-listing/">Create an appealing listing</a><ul class="section"> <li><a href="#your-add-ons-name">Your add-on’s name</a></li> <li><a href="#create-a-captivating-icon">Create a captivating icon</a></li> <li><a href="#create-a-meaningful-set-of-keywords">Create a meaningful set of keywords</a></li> <li><a href="#make-sure-your-summary-is-just-long-enough">Make sure your summary is just long enough</a></li> <li><a href="#focus-on-key-features-in-your-screenshots">Focus on key features in your screenshots</a></li> <li><a href="#the-add-on-description-can-be-longer-but-not-too-long">The add-on description can be longer, but not too long</a></li> <li><a href="#make-it-local">Make it local</a></li> <li><a href="#make-it-experimental">Make it experimental</a></li> <li><a href="#select-the-right-platforms-and-versions">Select the right platforms and versions</a></li> <li><a href="#categorize-well">Categorize well</a></li> <li><a href="#be-prepared-to-provide-support">Be prepared to provide support</a></li> <li><a href="#set-up-a-developer-profile">Set up a developer profile</a></li> <li><a href="#use-plain-language-in-any-privacy-policy-or-license-agreement">Use plain language in any privacy policy or license agreement</a></li> <li><a href="#gently-ask-for-a-review">Gently ask for a review</a></li> <li><a href="#make-use-of-markdown">Make use of Markdown</a></li> <li><a href="#some-other-points">Some other points</a></li> </ul> </li> <li> <a href="https://www.youtube.com/watch?v=a0_OsLGI0k4">What’s great content and design?</a> </li> <li> <a href="/documentation/publish/promoting-your-extension/">Promoting your extension</a><ul class="section"> <li><a href="#promote-your-addon">Promote your add-on from your website</a></li> <li><a href="#friends-family-colleagues">Friends, family, and colleagues</a></li> <li><a href="#events-and-meetups">Events and meetups</a></li> <li><a href="#current-users">Current users</a></li> <li><a href="#social-media">Social media</a></li> <li><a href="#engage-with-users">Engage with your users</a></li> <li><a href="#create-a-forum">Create a forum, user group, or similar</a></li> <li><a href="#engage-with-media">Engage with bloggers and news media</a></li> <li><a href="#advertising">Advertising</a></li> </ul> </li> <li> <a href="/documentation/publish/make-money-from-browser-extensions/">Make money from browser extensions</a><ul class="section"> <li><a href="#sell-through-AMO">Will I ever be able to sell through AMO?</a></li> <li><a href="#what-cant-you-do">What can't you do</a></li> <li><a href="#what-can-you-do">What can you do</a></li> <li><a href="#unsolicited-offers">Unsolicited offers</a></li> <li><a href="#maximize-income">How can I maximize my income?</a></li> </ul> </li> <li> <a href="/documentation/publish/recommended-extensions/">Recommended extensions</a><ul class="section"> <li><a href="#overview">Overview</a></li> <li><a href="#criteria">Criteria for Recommended extensions</a></li> <li><a href="#partnership">Developer partnership</a></li> <li><a href="#selection">Selection process</a></li> </ul> </li> </ul> </div> </li> <li class="has-children"> <a href="/documentation/manage/" data-overviewtitle="Manage Overview">Manage</a> <ul class="section"> <li><a href="#stay-informed-when-firefox-changes">Stay informed when Firefox changes</a></li> <li><a href="#publish-extension-updates">Publish extension updates</a></li> <li><a href="#manage-authors-of-your-extension">Manage authors of your extension</a></li> <li><a href="#promote-your-extension">Promote your extension</a></li> <li><a href="#removing-your-extension-from-distribution">Removing your extension from distribution</a></li> </ul> <div class="category"> <h6>Resources</h6> <ul> <li> <a href="/documentation/manage/updating-your-extension/">Updating your extension</a><ul class="section"> <li><a href="#enable-update">Enabling updates to your extension</a></li> <li><a href="#manifest-structure">Manifest structure</a></li> <li><a href="#testing-automatic-updating">Testing automatic updating</a></li> </ul> </li> <li> <a href="/documentation/manage/best-practices-for-updating/">Best practices for updating your extension</a> </li> <li> <a href="/documentation/manage/monitoring-extension-usage-statistics/">Monitoring extension usage statistics</a><ul class="section"> <li><a href="#accessing-the-statistics-dashboard">Accessing the statistics dashboard</a></li> <li><a href="#tracking-external-sources">Tracking external sources</a></li> <li><a href="#add-on-listing-example">Add-on listing example</a></li> </ul> </li> <li> <a href="/documentation/manage/resources-for-publishers/">Resources for publishers</a> </li> <li> <a href="/documentation/manage/retiring-your-extension/">Retiring your extension</a><ul class="section"> <li><a href="#reasons-for-withdrawing">Reasons for withdrawing your extension</a></li> <li><a href="#steps-to-retiring-an-extension">Steps to retiring an extension</a></li> <li><a href="#suggested-retirement-timetable">Suggested retirement timetable</a></li> </ul> </li> </ul> </div> </li> <li class="has-children"> <a href="/documentation/enterprise/" data-overviewtitle="Enterprise Overview">Enterprise</a> <ul class="section"> <li><a href="#developing-your-enterprise-extension">Developing your enterprise extension</a></li> <li><a href="#distributing-your-enterprise-extension">Distributing your enterprise extension</a></li> </ul> <div class="category"> <h6>Enterprise support</h6> <ul> <li> <a href="https://support.mozilla.org/products/firefox-enterprise/policies-customization-enterprise/manage-add-ons-enterprise">Manage add-ons for Firefox for Enterprise</a> </li> <li> <a href="https://support.mozilla.org/kb/install-system-add-ons-firefox-enterprise">Install system add-ons for Firefox for Enterprise</a> </li> </ul> </div> <div class="category"> <h6>Enterprise resources</h6> <ul> <li> <a href="/documentation/enterprise/enterprise-development/">Enterprise development</a><ul class="section"> <li><a href="#enterprise-consent">Data collection disclosure and consent for enterprise extensions</a></li> <li><a href="#how-to-add-policy">How to add policy support</a></li> <li><a href="#distributing-your-policy">Distributing your policy</a></li> </ul> </li> <li> <a href="/documentation/enterprise/enterprise-policies-that-impact-extensions/">Enterprise policies that impact extensions</a><ul class="section"> <li><a href="#relevant-policies">Relevant policies</a></li> <li><a href="#other-relevant-policies">Other relevant policies</a></li> </ul> </li> <li> <a href="/documentation/enterprise/enterprise-distribution/">Enterprise distribution</a><ul class="section"> <li><a href="#signed-vs-unsigned">Signed vs. unsigned extensions</a></li> <li><a href="#using-an-extensionsettings-policy">Using an ExtensionSettings policy</a></li> <li><a href="#bundling-add-ons-with-custom-Firefox">Bundling add-ons with a custom Firefox</a></li> </ul> </li> </ul> </div> </li> <li class="has-children"> <a href="/documentation/themes/" data-overviewtitle="Themes Overview">Themes</a> <div class="category"> <h6>Creating themes</h6> <ul> <li> <a href="/documentation/themes/using-the-amo-theme-generator/">Using the AMO theme generator</a><ul class="section"> <li><a href="#getting-started">Getting started</a></li> <li><a href="#submitting-your-theme">Submitting your theme</a></li> <li><a href="#updating-your-theme">Updating your theme</a></li> </ul> </li> <li> <a href="/documentation/themes/static-themes/">Static themes</a><ul class="section"> <li><a href="#introduction">Introduction</a></li> <li><a href="#create-a-simple-static-theme">Create a simple static theme</a></li> <li><a href="#updating-static-themes">Updating static themes</a></li> <li><a href="#single-image-themes">Single image themes</a></li> <li><a href="#multiple-image-themes">Multiple image themes</a></li> <li><a href="#static-animated-themes">Static animated themes</a></li> </ul> </li> <li> <a href="/documentation/themes/dynamic-themes/">Dynamic themes</a><ul class="section"> <li><a href="#introduction">Introduction</a></li> <li><a href="#creating-dynamic-themes">Creating dynamic themes</a></li> <li><a href="#publishing-dynamic-themes">Publishing dynamic themes</a></li> </ul> </li> <li> <a href="/documentation/themes/cross-browser-compatibility/">Cross-browser compatibility</a> </li> </ul> </div> </li> </ul> </li><li class="has-children"> <a href="/community/" data-overviewtitle="Community Overview">Community</a> <ul class="section"> <li><a href="#who-is-part-of-the-community">Who is part of the community?</a></li> <li><a href="#connect-with-the-community">Connect with the community</a></li> <li><a href="#get-involved-in-the-community">Get involved in the community</a></li> </ul> <div class="category"> <h6>Get in touch</h6> <ul> <li> <a href="https://discourse.mozilla.org/c/add-ons">Community Forum</a> </li> <li> <a href="https://blog.mozilla.org/addons/">Add-ons Blog</a> </li> <li> <a href="/community/#office-hours">Office Hours</a> </li> <li> <a href="https://stackoverflow.com/tags/firefox-addon">Stack Overflow</a> </li> <li> <a href="https://calendar.google.com/calendar?cid=bW96aWxsYS5jb21fb2ZqbGN0MDdrMTc4NHYxdTUxYnFrNDc2YmtAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ">Communication Calendar</a> </li> <li> <a href="https://mail.mozilla.org/listinfo/dev-addons">Dev Mailing List</a> </li> </ul> </div><div class="category"> <h6>Contribute</h6> <ul> <li> <a href="https://wiki.mozilla.org/Add-ons/Contribute">Contribution opportunities</a> </li> <li> <a href="https://wiki.mozilla.org/WebExtensions/Contribution_Onramp">Onboard to the WebExtensions codebase</a> </li> <li> <a href="https://wiki.mozilla.org/WebExtensions/Hacking">Hacking guide for WebExtensions code contributions</a> </li> <li> <a href="https://webextensions-experiments.readthedocs.io/">WebExtensions Experiments</a> </li> <li> <a href="https://bugzilla.mozilla.org">Find or create a bug</a> </li> </ul> </div> </li> </ul> <a href="https://addons.mozilla.org/developers/addons" class="button large hide-for-large">Submit or Manage Extensions</a> </nav> <button class="search-input-open">Search</button> <a href="https://addons.mozilla.org/developers/addons" class="button show-for-large">Submit or Manage Extensions</a> <section class="search-input" role="search"> <form class="search-interface" action="/search-results/" method="get"> <label for="lunrsearch">Search</label> <input type="search" id="lunrsearch" name="q" maxlength="255" value="" placeholder="Search documentation" minlength="3" required=""> <input type="submit" value="Search"> </form> <button class="search-input-close"></button> </section> </div> </div> </header> <div class="site-wrapper"> <nav role="navigation" class="sidenav"> <div class="sidenav-status"> <div class="sidenav-status-instruction">Select a section</div> <div id="sidenav-status-pagename">Page Name</div> </div> <div class="sidenav-top" aria-hidden="true"><ul class="primary"><li> <a href="/extension-basics/" data-overviewtitle="Extension Basics Overview">Extension Basics</a> <ul class="section"> <li><a href="#getting-started">Getting started</a></li> <li><a href="#mozilla-developer-network">Mozilla Developer Network</a></li> </ul> </li> <li class="has-children has-subfolder"> <span class="label">Documentation Topics</span> <ul class="subfolder"> <li class="has-children"> <a href="/documentation/develop/" data-overviewtitle="Develop Overview">Develop</a> <ul class="section"> <li><a href="#firefox-tools">Firefox Tools</a></li> <li><a href="#user-experience">User Experience</a></li> <li><a href="#firefox-for-android">Firefox for Android</a></li> <li><a href="#port-to-firefox">Port to Firefox</a></li> <li><a href="#test-and-debug">Test and debug</a></li> </ul> <div class="category"> <h6>Getting Started</h6> <ul> <li> <a href="/documentation/develop/unique-firefox-capabilities/">Unique Firefox Capabilities</a> </li> <li> <a href="/documentation/develop/firefox-workflow-overview/">Firefox Workflow Overview</a> </li> <li> <a href="/documentation/develop/about-the-webextensions-api/">About the WebExtensions API</a> </li> </ul> </div> <div class="category"> <h6>Manifest V3</h6> <ul> <li class="is-active"> <a href="/documentation/develop/manifest-v3-migration-guide/">Manifest V3 migration guide</a><ul class="section"> <li><a href="#what-is-manifest-v3">What is Manifest V3?</a></li> <li><a href="#developer-preview-changes">Manifest V3 changes</a></li> <li><a href="#migration-checklist">Migration checklist</a></li> </ul> </li> </ul> </div> <div class="category"> <h6>Cross-Browser Development</h6> <ul> <li> <a href="/documentation/develop/browser-compatibility/">Browser Compatibility</a><ul class="section"> <li><a href="#namespace">Namespace</a></li> <li><a href="#asynchronous">Asynchronous</a></li> <li><a href="#api-coverage">API Coverage</a></li> <li><a href="#manifest-keys">Manifest keys</a></li> <li><a href="#more-information">More information</a></li> </ul> </li> <li> <a href="https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/Build_a_cross_browser_extension">Build cross-browser extensions</a> </li> </ul> </div> <div class="category"> <h6>Firefox Tools</h6> <ul> <li> <a href="https://www.youtube.com/watch?v=Q3AQ5D2QFwc">Build an extension in 5 minutes</a> </li> <li> <a href="/documentation/develop/browser-extension-development-tools/">Browser Extension Development Tools</a><ul class="section"> <li><a href="#boilerplating-tools">Boilerplating tools</a></li> <li><a href="#coding-tools">Coding tools</a></li> <li><a href="#testing-and-debugging-tools">Testing and debugging tools</a></li> <li><a href="#translation-tools">Translation tools</a></li> <li><a href="#tools-for-firefox-for-android">Tools for Firefox for Android</a></li> </ul> </li> <li> <a href="/documentation/develop/choosing-a-firefox-version-for-extension-development/">Choosing a Firefox version for extension development</a><ul class="section"> <li><a href="#firefox-editions">Firefox editions</a></li> <li><a href="#firefox-version-and-their-web-extension-development-capabilities">Firefox version and their web extension development capabilities</a></li> </ul> </li> <li> <a href="/documentation/develop/getting-started-with-web-ext/">Getting started with web-ext</a><ul class="section"> <li><a href="#installation-section">Installation</a></li> <li><a href="#update-section">Update</a></li> <li><a href="#using-web-ext-section">Using web-ext</a></li> <li><a href="#check-with-lint">Check your code</a></li> <li><a href="#test-and-degug-an-extention">Test and debug</a></li> <li><a href="#package-sign-and-publish-an-extension">Package, sign, and publish</a></li> <li><a href="#use-the-configuration-file">Use the configuration file</a></li> <li><a href="#advanced-topics">Advanced topics</a></li> <li><a href="#see-also-section">See also</a></li> </ul> </li> <li> <a href="/documentation/develop/web-ext-command-reference/">web-ext v8 command reference</a><ul class="section"> <li><a href="#whats-new">What's new</a></li> <li><a href="#commands">Commands</a></li> <li><a href="#web-ext-build"><code>web-ext build</code></a></li> <li><a href="#web-ext-docs"><code>web-ext docs</code></a></li> <li><a href="#web-ext-dump-config"><code>web-ext dump-config</code></a></li> <li><a href="#web-ext-lint"><code>web-ext lint</code></a></li> <li><a href="#web-ext-run"><code>web-ext run</code></a></li> <li><a href="#web-ext-sign"><code>web-ext sign</code></a></li> <li><a href="#global-options">Global options</a></li> <li><a href="#setting-option-environment-variables">Setting option environment variables</a></li> <li><a href="#see-also">See also</a></li> </ul> </li> <li> <a href="/documentation/develop/web-ext-command-reference-v7/">web-ext v7 command reference</a><ul class="section"> <li><a href="#commands">Commands</a></li> <li><a href="#global-options">Global options</a></li> <li><a href="#setting-option-environment-variables">Setting option environment variables</a></li> <li><a href="#see-also">See also</a></li> </ul> </li> <li> <a href="https://github.com/hiikezoe/web-ext-webpack-plugin/blob/master/README.md">Web-ext Webpack plug-in</a> </li> <li> <a href="https://github.com/mozilla/webextension-polyfill">Browser API Polyfill</a> </li> <li> <a href="/documentation/develop/extensions-and-the-add-on-id/">Extensions and the Add-on ID</a><ul class="section"> <li><a href="#basic-workflow-with-no-add-on-id">Basic workflow with no add-on ID</a></li> <li><a href="#when-do-you-need-an-add-on-id">When do you need an add-on ID?</a></li> </ul> </li> </ul> </div> <div class="category"> <h6>User Experience</h6> <ul> <li> <a href="/documentation/develop/build-a-secure-extension/">Build a secure extension</a> </li> <li> <a href="/documentation/develop/request-the-right-permissions/">Request the right permissions</a><ul class="section"> <li><a href="#introduction">Introduction</a></li> <li><a href="#advised-permissions">Advised permissions</a></li> <li><a href="#avoid-unnecessary-permissions">Avoid unnecessary permissions</a></li> <li><a href="#request-permissions-at-runtime">Request permissions at runtime</a></li> <li><a href="#add-information-about-permissions-to-your-extensions-amo-page">Add information about permissions to your extensions AMO page</a></li> </ul> </li> <li> <a href="/documentation/develop/best-practices-for-collecting-user-data-consents/">Best practices for collecting user data consents</a><ul class="section"> <li><a href="#know-your-privacy-settings">Know your privacy settings</a></li> <li><a href="#get-prepared">Get prepared</a></li> <li><a href="#create-a-privacy-policy">Create a privacy policy</a></li> <li><a href="#prompt-after-install">Prompt after install</a></li> <li><a href="#determine-your-consent-flow">Determine your consent flow</a></li> <li><a href="#your-consent-dialogs">Your consent dialogs</a></li> </ul> </li> <li> <a href="/documentation/develop/build-an-accessible-extension/">Build an accessible extension</a> </li> <li> <a href="/documentation/develop/onboard-upboard-offboard-users/">Onboard, upboard, offboard users</a><ul class="section"> <li><a href="#onboarding">Onboarding</a></li> <li><a href="#upboarding">Upboarding</a></li> <li><a href="#offboarding">Offboarding</a></li> </ul> </li> <li> <a href="/documentation/develop/user-experience-best-practices/">User experience best practices</a><ul class="section"> <li><a href="#keep-it-focused">1. Keep it focused</a></li> <li><a href="#give-users-what-they-need-where-they-need-it">2. Give users what they need, where they need it</a></li> <li><a href="#keep-the-user-informed">3. Keep the user informed</a></li> <li><a href="#be-firefoxy-in-look-and-feel">4. Be Firefoxy in look and feel</a></li> <li><a href="#great-onboarding-experience">5. Great onboarding experience</a></li> <li><a href="#test-test-and-then-test-again">6. Test, test, and then test again</a></li> </ul> </li> </ul> </div> <div class="category"> <h6>Mobile</h6> <ul> <li> <a href="/documentation/develop/differences-between-desktop-and-android-extensions/">Differences between desktop and Android extensions</a><ul class="section"> <li><a href="#introduction">Introduction</a></li> <li><a href="#user-interface">User interface</a></li> <li><a href="#native-application-interaction">Native application interaction</a></li> <li><a href="#permissions">Permissions</a></li> <li><a href="#storage">Storage</a></li> </ul> </li> <li> <a href="/documentation/develop/user-experience-guidelines-for-mobile-extensions/">User experience guidelines for mobile extensions</a><ul class="section"> <li><a href="#introduction">Introduction</a></li> <li><a href="#the-basics">The basics</a></li> <li><a href="#the-extra-mile">The extra mile</a></li> <li><a href="#the-last-mile">The last mile</a></li> </ul> </li> <li> <a href="/documentation/develop/developing-extensions-for-firefox-for-android/">Developing extensions for Firefox for Android</a><ul class="section"> <li><a href="#set-up-your-computer-and-android-emulator-or-device">Set up your computer and Android emulator or device</a></li> <li><a href="#check-for-firefox-for-android-compatibility">Check for Firefox for Android compatibility</a></li> <li><a href="#install-and-run-your-extension-in-firefox-for-android">Install and run your extension in Firefox for Android</a></li> <li><a href="#debug-your-extension">Debug your extension</a></li> <li><a href="#mv3-compatibility">Manifest V3 compatibility</a></li> </ul> </li> <li> <a href="https://github.com/mozilla/geckoview">GeckoView Extensions (Android library)</a> </li> </ul> </div> <div class="category"> <h6>Port Your Extension</h6> <ul> <li> <a href="/documentation/develop/porting-a-google-chrome-extension/">Porting a Google Chrome Extension</a> </li> </ul> </div> <div class="category"> <h6>Debug and Test</h6> <ul> <li> <a href="/documentation/develop/debugging/">Debugging</a><ul class="section"> <li><a href="#developer-tools-toolbox">Developer tools toolbox</a></li> <li><a href="#debugging-background-scripts">Debugging background scripts</a></li> <li><a href="#debugging-options-pages">Debugging options pages</a></li> <li><a href="#debugging-popups">Debugging popups</a></li> <li><a href="#debugging-content-scripts">Debugging content scripts</a></li> <li><a href="#debugging-sidebars">Debugging sidebars</a></li> <li><a href="#debugging-storage">Debugging storage</a></li> <li><a href="#debugging-developer-tools-pages-and-panels">Debugging developer tools pages and panels</a></li> <li><a href="#debug-permission-requests">Debug permission requests</a></li> <li><a href="#debugging-browser-restarts">Debugging browser restarts</a></li> </ul> </li> <li> <a href="/documentation/develop/temporary-installation-in-firefox/">Temporary Installation in Firefox</a><ul class="section"> <li><a href="#reloading-a-temporary-extension">Reloading a temporary extension</a></li> <li><a href="#using-the-command-line">Using the command line</a></li> <li><a href="#detecting-temporary-installation">Detecting temporary installation</a></li> <li><a href="#limitations">Limitations</a></li> </ul> </li> <li> <a href="/documentation/develop/testing-persistent-and-restart-features/">Testing persistent and restart features</a><ul class="section"> <li><a href="#what-is-an-add-on-id">What is an add-on ID?</a></li> <li><a href="#what-is-a-firefox-profile">What is a Firefox profile?</a></li> <li><a href="#extension-behavior-in-firefox">Extension behavior in Firefox</a></li> <li><a href="#what-do-i-do-to-ensure-i-can-test-my-extension">What do I do to ensure I can test my extension?</a></li> </ul> </li> <li> <a href="/documentation/develop/test-permission-requests/">Test permission requests</a><ul class="section"> <li><a href="#permission-grant-behavior-during-testing">Permission grant behavior during testing</a></li> <li><a href="#observe-or-verify-install-time-permission-requests">Observe or verify install time permission requests</a></li> <li><a href="#retest-runtime-permission-grants">Retest runtime permission grants</a></li> </ul> </li> <li> <a href="/documentation/develop/known-issues/">Known issues</a><ul class="section"> <li><a href="#invisible-content-scripts">Content scripts don't appear in DevTools</a></li> <li><a href="#devtools-updates-missing">Extension source don't update in DevTools</a></li> <li><a href="#android-destroyed-actor">"Destroyed actor" errors when debugging Android</a></li> </ul> </li> </ul> </div> </li> <li class="has-children"> <a href="/documentation/publish/" data-overviewtitle="Publish Overview">Publish</a> <ul class="section"> <li><a href="#get-your-extension-signed">Get your extension signed</a></li> <li><a href="#distribute-your-signed-extension">Distribute your signed extension</a></li> <li><a href="#promote-your-extension">Promote your extension</a></li> </ul> <div class="category"> <h6>Policies</h6> <ul> <li> <a href="/documentation/publish/add-on-policies/">Add-on Policies</a><ul class="section"> <li><a href="#no-surprises">No Surprises</a></li> <li><a href="#content">Content</a></li> <li><a href="#submission-guidelines">Submission Guidelines</a></li> <li><a href="#development-practices">Development Practices</a></li> <li><a href="#data-disclosure-collection-and-management">Data Disclosure, Collection and Management</a></li> <li><a href="#monetization">Monetization</a></li> <li><a href="#security-compliance-and-blocking">Security, Compliance and Blocking</a></li> </ul> </li> <li> <a href="/documentation/publish/firefox-add-on-distribution-agreement/">Firefox Add-on Distribution Agreement</a><ul class="section"> <li><a href="#introduction">1. Introduction</a></li> <li><a href="#accounts">2. Accounts</a></li> <li><a href="#privacy-policy">3. Privacy Policy</a></li> <li><a href="#distribution-certificates-and-review-process">4. Distribution, certificates, & review process</a></li> <li><a href="#your-obligations">5. Your obligations</a></li> <li><a href="#licenses-proprietary-rights">6. Licenses; proprietary rights</a></li> <li><a href="#content-removal">7. Content removal</a></li> <li><a href="#disclaimer-of-warranties">8. Disclaimer of warranties</a></li> <li><a href="#limitation-of-liability">9. Limitation of liability</a></li> <li><a href="#release-idemnification">10. Release; indemnification</a></li> <li><a href="#general-legal-terms">11. General legal terms</a></li> </ul> </li> <li> <a href="/documentation/publish/add-ons-blocking-process/">Add-ons Blocking Process</a><ul class="section"> <li><a href="#security-over-choice">Security Over Choice</a></li> <li><a href="#blocking-criteria">Blocking Criteria</a></li> <li><a href="#developer-outreach">Developer Outreach</a></li> <li><a href="#requesting-a-block">Requesting a Block</a></li> <li><a href="#blocking-other-types-of-third-party-software">Blocking Other Types of Third Party Software</a></li> </ul> </li> <li> <a href="/documentation/publish/third-party-library-usage/">Third Party Library Usage</a><ul class="section"> <li><a href="#when-must-links-for-third-party-libraries-be-provided">When must links for third-party libraries be provided?</a></li> <li><a href="#how-to-determine-the-third-party-library-link">How to determine the third-party library link</a></li> <li><a href="#communicating-third-party-library-links-to-the-reviewer">Communicating third-party library links to reviewers</a></li> </ul> </li> <li> <a href="/documentation/publish/what-does-review-rejection-mean-to-users/">What does review rejection mean to users?</a><ul class="section"> <li><a href="#review-overview">Review overview</a></li> <li><a href="#impact-of-review-rejection">Impact of review rejection</a></li> <li><a href="#blocklisting">Blocklisting</a></li> </ul> </li> </ul> </div> <div class="category"> <h6>Sign</h6> <ul> <li> <a href="/documentation/publish/signing-and-distribution-overview/">Signing and distribution overview</a><ul class="section"> <li><a href="#signing-your-addons">Signing your add-ons</a></li> <li><a href="#distributing-your-addon">Distributing your add-on</a></li> <li><a href="#post-submission-review">Post-submission review</a></li> <li><a href="#about-amo">More information about AMO</a></li> </ul> </li> <li> <a href="/documentation/publish/package-your-extension/">Package your extension</a><ul class="section"> <li><a href="#package-windows">Windows</a></li> <li><a href="#package-mac">Mac OSX</a></li> <li><a href="#package-linux">Linux / Mac OSX Terminal</a></li> </ul> </li> </ul> </div> <div class="category"> <h6>Distribute</h6> <ul> <li> <a href="/documentation/publish/distribute-manifest-versions/">Distribute Manifest V2 and V3 extensions</a> </li> <li> <a href="/documentation/publish/distribute-pre-release-versions/">Distribute pre-release versions</a> </li> <li> <a href="/documentation/publish/submitting-an-add-on/">Submitting an add-on</a><ul class="section"> <li><a href="#listing-on-amo">Listing on AMO</a></li> <li><a href="#self-distribution">Self-distribution</a></li> <li><a href="#get-help">Get help</a></li> </ul> </li> <li> <a href="/documentation/publish/source-code-submission/">Source code submission</a><ul class="section"> <li><a href="#provide-your-extension-source-code">Provide your extension source code</a></li> <li><a href="#default-reviewer-build-environment">Default reviewer build environment</a></li> <li><a href="#use-of-obfuscated-code">Use of obfuscated code</a></li> <li><a href="#source-code-checklist">Source code checklist</a></li> </ul> </li> <li> <a href="/documentation/publish/version-compatibility/">Firefox version compatibility</a><ul class="section"> <li><a href="#compatibility">Version compatibility</a></li> <li><a href="#browser-specific-settings">The `browser_specific_settings` key</a></li> <li><a href="#amo-compatibility">AMO compatibility setting</a></li> <li><a href="#recommendations">Recommendations</a></li> </ul> </li> <li> <a href="/documentation/publish/add-on-ownership/">Add-on ownership</a><ul class="section"> <li><a href="#transfer-ownership">Transfer ownership</a></li> <li><a href="#code-disputes">Code disputes</a></li> </ul> </li> <li> <a href="/documentation/publish/developer-accounts/">Developer accounts</a><ul class="section"> <li><a href="#setting-a-display-name">Setting a display name</a></li> <li><a href="#blocked-accounts">Blocked accounts</a></li> <li><a href="#email-issues">Issues receiving emails from AMO</a></li> </ul> </li> <li> <a href="/documentation/publish/self-distribution/">Self-distribution</a><ul class="section"> <li><a href="#options">Self-distribution options</a></li> </ul> </li> <li> <a href="/documentation/publish/distribute-sideloading/">Sideloading</a><ul class="section"> <li><a href="#preparing-your-addon">Preparing your add-on</a></li> <li><a href="#install-addon-from-file">Install add-on from file</a></li> <li><a href="#standard-extension-folders">Installation using the standard extension folders</a></li> </ul> </li> <li> <a href="/documentation/publish/distribute-for-desktop-apps/">For desktop apps</a> </li> </ul> </div> <div class="category"> <h6>Promote</h6> <ul> <li> <a href="/documentation/develop/create-an-appealing-listing/">Create an appealing listing</a><ul class="section"> <li><a href="#your-add-ons-name">Your add-on’s name</a></li> <li><a href="#create-a-captivating-icon">Create a captivating icon</a></li> <li><a href="#create-a-meaningful-set-of-keywords">Create a meaningful set of keywords</a></li> <li><a href="#make-sure-your-summary-is-just-long-enough">Make sure your summary is just long enough</a></li> <li><a href="#focus-on-key-features-in-your-screenshots">Focus on key features in your screenshots</a></li> <li><a href="#the-add-on-description-can-be-longer-but-not-too-long">The add-on description can be longer, but not too long</a></li> <li><a href="#make-it-local">Make it local</a></li> <li><a href="#make-it-experimental">Make it experimental</a></li> <li><a href="#select-the-right-platforms-and-versions">Select the right platforms and versions</a></li> <li><a href="#categorize-well">Categorize well</a></li> <li><a href="#be-prepared-to-provide-support">Be prepared to provide support</a></li> <li><a href="#set-up-a-developer-profile">Set up a developer profile</a></li> <li><a href="#use-plain-language-in-any-privacy-policy-or-license-agreement">Use plain language in any privacy policy or license agreement</a></li> <li><a href="#gently-ask-for-a-review">Gently ask for a review</a></li> <li><a href="#make-use-of-markdown">Make use of Markdown</a></li> <li><a href="#some-other-points">Some other points</a></li> </ul> </li> <li> <a href="https://www.youtube.com/watch?v=a0_OsLGI0k4">What’s great content and design?</a> </li> <li> <a href="/documentation/publish/promoting-your-extension/">Promoting your extension</a><ul class="section"> <li><a href="#promote-your-addon">Promote your add-on from your website</a></li> <li><a href="#friends-family-colleagues">Friends, family, and colleagues</a></li> <li><a href="#events-and-meetups">Events and meetups</a></li> <li><a href="#current-users">Current users</a></li> <li><a href="#social-media">Social media</a></li> <li><a href="#engage-with-users">Engage with your users</a></li> <li><a href="#create-a-forum">Create a forum, user group, or similar</a></li> <li><a href="#engage-with-media">Engage with bloggers and news media</a></li> <li><a href="#advertising">Advertising</a></li> </ul> </li> <li> <a href="/documentation/publish/make-money-from-browser-extensions/">Make money from browser extensions</a><ul class="section"> <li><a href="#sell-through-AMO">Will I ever be able to sell through AMO?</a></li> <li><a href="#what-cant-you-do">What can't you do</a></li> <li><a href="#what-can-you-do">What can you do</a></li> <li><a href="#unsolicited-offers">Unsolicited offers</a></li> <li><a href="#maximize-income">How can I maximize my income?</a></li> </ul> </li> <li> <a href="/documentation/publish/recommended-extensions/">Recommended extensions</a><ul class="section"> <li><a href="#overview">Overview</a></li> <li><a href="#criteria">Criteria for Recommended extensions</a></li> <li><a href="#partnership">Developer partnership</a></li> <li><a href="#selection">Selection process</a></li> </ul> </li> </ul> </div> </li> <li class="has-children"> <a href="/documentation/manage/" data-overviewtitle="Manage Overview">Manage</a> <ul class="section"> <li><a href="#stay-informed-when-firefox-changes">Stay informed when Firefox changes</a></li> <li><a href="#publish-extension-updates">Publish extension updates</a></li> <li><a href="#manage-authors-of-your-extension">Manage authors of your extension</a></li> <li><a href="#promote-your-extension">Promote your extension</a></li> <li><a href="#removing-your-extension-from-distribution">Removing your extension from distribution</a></li> </ul> <div class="category"> <h6>Resources</h6> <ul> <li> <a href="/documentation/manage/updating-your-extension/">Updating your extension</a><ul class="section"> <li><a href="#enable-update">Enabling updates to your extension</a></li> <li><a href="#manifest-structure">Manifest structure</a></li> <li><a href="#testing-automatic-updating">Testing automatic updating</a></li> </ul> </li> <li> <a href="/documentation/manage/best-practices-for-updating/">Best practices for updating your extension</a> </li> <li> <a href="/documentation/manage/monitoring-extension-usage-statistics/">Monitoring extension usage statistics</a><ul class="section"> <li><a href="#accessing-the-statistics-dashboard">Accessing the statistics dashboard</a></li> <li><a href="#tracking-external-sources">Tracking external sources</a></li> <li><a href="#add-on-listing-example">Add-on listing example</a></li> </ul> </li> <li> <a href="/documentation/manage/resources-for-publishers/">Resources for publishers</a> </li> <li> <a href="/documentation/manage/retiring-your-extension/">Retiring your extension</a><ul class="section"> <li><a href="#reasons-for-withdrawing">Reasons for withdrawing your extension</a></li> <li><a href="#steps-to-retiring-an-extension">Steps to retiring an extension</a></li> <li><a href="#suggested-retirement-timetable">Suggested retirement timetable</a></li> </ul> </li> </ul> </div> </li> <li class="has-children"> <a href="/documentation/enterprise/" data-overviewtitle="Enterprise Overview">Enterprise</a> <ul class="section"> <li><a href="#developing-your-enterprise-extension">Developing your enterprise extension</a></li> <li><a href="#distributing-your-enterprise-extension">Distributing your enterprise extension</a></li> </ul> <div class="category"> <h6>Enterprise support</h6> <ul> <li> <a href="https://support.mozilla.org/products/firefox-enterprise/policies-customization-enterprise/manage-add-ons-enterprise">Manage add-ons for Firefox for Enterprise</a> </li> <li> <a href="https://support.mozilla.org/kb/install-system-add-ons-firefox-enterprise">Install system add-ons for Firefox for Enterprise</a> </li> </ul> </div> <div class="category"> <h6>Enterprise resources</h6> <ul> <li> <a href="/documentation/enterprise/enterprise-development/">Enterprise development</a><ul class="section"> <li><a href="#enterprise-consent">Data collection disclosure and consent for enterprise extensions</a></li> <li><a href="#how-to-add-policy">How to add policy support</a></li> <li><a href="#distributing-your-policy">Distributing your policy</a></li> </ul> </li> <li> <a href="/documentation/enterprise/enterprise-policies-that-impact-extensions/">Enterprise policies that impact extensions</a><ul class="section"> <li><a href="#relevant-policies">Relevant policies</a></li> <li><a href="#other-relevant-policies">Other relevant policies</a></li> </ul> </li> <li> <a href="/documentation/enterprise/enterprise-distribution/">Enterprise distribution</a><ul class="section"> <li><a href="#signed-vs-unsigned">Signed vs. unsigned extensions</a></li> <li><a href="#using-an-extensionsettings-policy">Using an ExtensionSettings policy</a></li> <li><a href="#bundling-add-ons-with-custom-Firefox">Bundling add-ons with a custom Firefox</a></li> </ul> </li> </ul> </div> </li> <li class="has-children"> <a href="/documentation/themes/" data-overviewtitle="Themes Overview">Themes</a> <div class="category"> <h6>Creating themes</h6> <ul> <li> <a href="/documentation/themes/using-the-amo-theme-generator/">Using the AMO theme generator</a><ul class="section"> <li><a href="#getting-started">Getting started</a></li> <li><a href="#submitting-your-theme">Submitting your theme</a></li> <li><a href="#updating-your-theme">Updating your theme</a></li> </ul> </li> <li> <a href="/documentation/themes/static-themes/">Static themes</a><ul class="section"> <li><a href="#introduction">Introduction</a></li> <li><a href="#create-a-simple-static-theme">Create a simple static theme</a></li> <li><a href="#updating-static-themes">Updating static themes</a></li> <li><a href="#single-image-themes">Single image themes</a></li> <li><a href="#multiple-image-themes">Multiple image themes</a></li> <li><a href="#static-animated-themes">Static animated themes</a></li> </ul> </li> <li> <a href="/documentation/themes/dynamic-themes/">Dynamic themes</a><ul class="section"> <li><a href="#introduction">Introduction</a></li> <li><a href="#creating-dynamic-themes">Creating dynamic themes</a></li> <li><a href="#publishing-dynamic-themes">Publishing dynamic themes</a></li> </ul> </li> <li> <a href="/documentation/themes/cross-browser-compatibility/">Cross-browser compatibility</a> </li> </ul> </div> </li> </ul> </li><li class="has-children"> <a href="/community/" data-overviewtitle="Community Overview">Community</a> <ul class="section"> <li><a href="#who-is-part-of-the-community">Who is part of the community?</a></li> <li><a href="#connect-with-the-community">Connect with the community</a></li> <li><a href="#get-involved-in-the-community">Get involved in the community</a></li> </ul> <div class="category"> <h6>Get in touch</h6> <ul> <li> <a href="https://discourse.mozilla.org/c/add-ons">Community Forum</a> </li> <li> <a href="https://blog.mozilla.org/addons/">Add-ons Blog</a> </li> <li> <a href="/community/#office-hours">Office Hours</a> </li> <li> <a href="https://stackoverflow.com/tags/firefox-addon">Stack Overflow</a> </li> <li> <a href="https://calendar.google.com/calendar?cid=bW96aWxsYS5jb21fb2ZqbGN0MDdrMTc4NHYxdTUxYnFrNDc2YmtAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ">Communication Calendar</a> </li> <li> <a href="https://mail.mozilla.org/listinfo/dev-addons">Dev Mailing List</a> </li> </ul> </div><div class="category"> <h6>Contribute</h6> <ul> <li> <a href="https://wiki.mozilla.org/Add-ons/Contribute">Contribution opportunities</a> </li> <li> <a href="https://wiki.mozilla.org/WebExtensions/Contribution_Onramp">Onboard to the WebExtensions codebase</a> </li> <li> <a href="https://wiki.mozilla.org/WebExtensions/Hacking">Hacking guide for WebExtensions code contributions</a> </li> <li> <a href="https://webextensions-experiments.readthedocs.io/">WebExtensions Experiments</a> </li> <li> <a href="https://bugzilla.mozilla.org">Find or create a bug</a> </li> </ul> </div> </li> </ul> </div> <div class="sidenav-detail"><ul class="primary"><li> <a href="/extension-basics/" data-overviewtitle="Extension Basics Overview">Extension Basics</a> <ul class="section"> <li><a href="#getting-started">Getting started</a></li> <li><a href="#mozilla-developer-network">Mozilla Developer Network</a></li> </ul> </li> <li class="has-children has-subfolder"> <span class="label">Documentation Topics</span> <ul class="subfolder"> <li class="has-children"> <a href="/documentation/develop/" data-overviewtitle="Develop Overview">Develop</a> <ul class="section"> <li><a href="#firefox-tools">Firefox Tools</a></li> <li><a href="#user-experience">User Experience</a></li> <li><a href="#firefox-for-android">Firefox for Android</a></li> <li><a href="#port-to-firefox">Port to Firefox</a></li> <li><a href="#test-and-debug">Test and debug</a></li> </ul> <div class="category"> <h6>Getting Started</h6> <ul> <li> <a href="/documentation/develop/unique-firefox-capabilities/">Unique Firefox Capabilities</a> </li> <li> <a href="/documentation/develop/firefox-workflow-overview/">Firefox Workflow Overview</a> </li> <li> <a href="/documentation/develop/about-the-webextensions-api/">About the WebExtensions API</a> </li> </ul> </div> <div class="category"> <h6>Manifest V3</h6> <ul> <li class="is-active"> <a href="/documentation/develop/manifest-v3-migration-guide/">Manifest V3 migration guide</a><ul class="section"> <li><a href="#what-is-manifest-v3">What is Manifest V3?</a></li> <li><a href="#developer-preview-changes">Manifest V3 changes</a></li> <li><a href="#migration-checklist">Migration checklist</a></li> </ul> </li> </ul> </div> <div class="category"> <h6>Cross-Browser Development</h6> <ul> <li> <a href="/documentation/develop/browser-compatibility/">Browser Compatibility</a><ul class="section"> <li><a href="#namespace">Namespace</a></li> <li><a href="#asynchronous">Asynchronous</a></li> <li><a href="#api-coverage">API Coverage</a></li> <li><a href="#manifest-keys">Manifest keys</a></li> <li><a href="#more-information">More information</a></li> </ul> </li> <li> <a href="https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/Build_a_cross_browser_extension">Build cross-browser extensions</a> </li> </ul> </div> <div class="category"> <h6>Firefox Tools</h6> <ul> <li> <a href="https://www.youtube.com/watch?v=Q3AQ5D2QFwc">Build an extension in 5 minutes</a> </li> <li> <a href="/documentation/develop/browser-extension-development-tools/">Browser Extension Development Tools</a><ul class="section"> <li><a href="#boilerplating-tools">Boilerplating tools</a></li> <li><a href="#coding-tools">Coding tools</a></li> <li><a href="#testing-and-debugging-tools">Testing and debugging tools</a></li> <li><a href="#translation-tools">Translation tools</a></li> <li><a href="#tools-for-firefox-for-android">Tools for Firefox for Android</a></li> </ul> </li> <li> <a href="/documentation/develop/choosing-a-firefox-version-for-extension-development/">Choosing a Firefox version for extension development</a><ul class="section"> <li><a href="#firefox-editions">Firefox editions</a></li> <li><a href="#firefox-version-and-their-web-extension-development-capabilities">Firefox version and their web extension development capabilities</a></li> </ul> </li> <li> <a href="/documentation/develop/getting-started-with-web-ext/">Getting started with web-ext</a><ul class="section"> <li><a href="#installation-section">Installation</a></li> <li><a href="#update-section">Update</a></li> <li><a href="#using-web-ext-section">Using web-ext</a></li> <li><a href="#check-with-lint">Check your code</a></li> <li><a href="#test-and-degug-an-extention">Test and debug</a></li> <li><a href="#package-sign-and-publish-an-extension">Package, sign, and publish</a></li> <li><a href="#use-the-configuration-file">Use the configuration file</a></li> <li><a href="#advanced-topics">Advanced topics</a></li> <li><a href="#see-also-section">See also</a></li> </ul> </li> <li> <a href="/documentation/develop/web-ext-command-reference/">web-ext v8 command reference</a><ul class="section"> <li><a href="#whats-new">What's new</a></li> <li><a href="#commands">Commands</a></li> <li><a href="#web-ext-build"><code>web-ext build</code></a></li> <li><a href="#web-ext-docs"><code>web-ext docs</code></a></li> <li><a href="#web-ext-dump-config"><code>web-ext dump-config</code></a></li> <li><a href="#web-ext-lint"><code>web-ext lint</code></a></li> <li><a href="#web-ext-run"><code>web-ext run</code></a></li> <li><a href="#web-ext-sign"><code>web-ext sign</code></a></li> <li><a href="#global-options">Global options</a></li> <li><a href="#setting-option-environment-variables">Setting option environment variables</a></li> <li><a href="#see-also">See also</a></li> </ul> </li> <li> <a href="/documentation/develop/web-ext-command-reference-v7/">web-ext v7 command reference</a><ul class="section"> <li><a href="#commands">Commands</a></li> <li><a href="#global-options">Global options</a></li> <li><a href="#setting-option-environment-variables">Setting option environment variables</a></li> <li><a href="#see-also">See also</a></li> </ul> </li> <li> <a href="https://github.com/hiikezoe/web-ext-webpack-plugin/blob/master/README.md">Web-ext Webpack plug-in</a> </li> <li> <a href="https://github.com/mozilla/webextension-polyfill">Browser API Polyfill</a> </li> <li> <a href="/documentation/develop/extensions-and-the-add-on-id/">Extensions and the Add-on ID</a><ul class="section"> <li><a href="#basic-workflow-with-no-add-on-id">Basic workflow with no add-on ID</a></li> <li><a href="#when-do-you-need-an-add-on-id">When do you need an add-on ID?</a></li> </ul> </li> </ul> </div> <div class="category"> <h6>User Experience</h6> <ul> <li> <a href="/documentation/develop/build-a-secure-extension/">Build a secure extension</a> </li> <li> <a href="/documentation/develop/request-the-right-permissions/">Request the right permissions</a><ul class="section"> <li><a href="#introduction">Introduction</a></li> <li><a href="#advised-permissions">Advised permissions</a></li> <li><a href="#avoid-unnecessary-permissions">Avoid unnecessary permissions</a></li> <li><a href="#request-permissions-at-runtime">Request permissions at runtime</a></li> <li><a href="#add-information-about-permissions-to-your-extensions-amo-page">Add information about permissions to your extensions AMO page</a></li> </ul> </li> <li> <a href="/documentation/develop/best-practices-for-collecting-user-data-consents/">Best practices for collecting user data consents</a><ul class="section"> <li><a href="#know-your-privacy-settings">Know your privacy settings</a></li> <li><a href="#get-prepared">Get prepared</a></li> <li><a href="#create-a-privacy-policy">Create a privacy policy</a></li> <li><a href="#prompt-after-install">Prompt after install</a></li> <li><a href="#determine-your-consent-flow">Determine your consent flow</a></li> <li><a href="#your-consent-dialogs">Your consent dialogs</a></li> </ul> </li> <li> <a href="/documentation/develop/build-an-accessible-extension/">Build an accessible extension</a> </li> <li> <a href="/documentation/develop/onboard-upboard-offboard-users/">Onboard, upboard, offboard users</a><ul class="section"> <li><a href="#onboarding">Onboarding</a></li> <li><a href="#upboarding">Upboarding</a></li> <li><a href="#offboarding">Offboarding</a></li> </ul> </li> <li> <a href="/documentation/develop/user-experience-best-practices/">User experience best practices</a><ul class="section"> <li><a href="#keep-it-focused">1. Keep it focused</a></li> <li><a href="#give-users-what-they-need-where-they-need-it">2. Give users what they need, where they need it</a></li> <li><a href="#keep-the-user-informed">3. Keep the user informed</a></li> <li><a href="#be-firefoxy-in-look-and-feel">4. Be Firefoxy in look and feel</a></li> <li><a href="#great-onboarding-experience">5. Great onboarding experience</a></li> <li><a href="#test-test-and-then-test-again">6. Test, test, and then test again</a></li> </ul> </li> </ul> </div> <div class="category"> <h6>Mobile</h6> <ul> <li> <a href="/documentation/develop/differences-between-desktop-and-android-extensions/">Differences between desktop and Android extensions</a><ul class="section"> <li><a href="#introduction">Introduction</a></li> <li><a href="#user-interface">User interface</a></li> <li><a href="#native-application-interaction">Native application interaction</a></li> <li><a href="#permissions">Permissions</a></li> <li><a href="#storage">Storage</a></li> </ul> </li> <li> <a href="/documentation/develop/user-experience-guidelines-for-mobile-extensions/">User experience guidelines for mobile extensions</a><ul class="section"> <li><a href="#introduction">Introduction</a></li> <li><a href="#the-basics">The basics</a></li> <li><a href="#the-extra-mile">The extra mile</a></li> <li><a href="#the-last-mile">The last mile</a></li> </ul> </li> <li> <a href="/documentation/develop/developing-extensions-for-firefox-for-android/">Developing extensions for Firefox for Android</a><ul class="section"> <li><a href="#set-up-your-computer-and-android-emulator-or-device">Set up your computer and Android emulator or device</a></li> <li><a href="#check-for-firefox-for-android-compatibility">Check for Firefox for Android compatibility</a></li> <li><a href="#install-and-run-your-extension-in-firefox-for-android">Install and run your extension in Firefox for Android</a></li> <li><a href="#debug-your-extension">Debug your extension</a></li> <li><a href="#mv3-compatibility">Manifest V3 compatibility</a></li> </ul> </li> <li> <a href="https://github.com/mozilla/geckoview">GeckoView Extensions (Android library)</a> </li> </ul> </div> <div class="category"> <h6>Port Your Extension</h6> <ul> <li> <a href="/documentation/develop/porting-a-google-chrome-extension/">Porting a Google Chrome Extension</a> </li> </ul> </div> <div class="category"> <h6>Debug and Test</h6> <ul> <li> <a href="/documentation/develop/debugging/">Debugging</a><ul class="section"> <li><a href="#developer-tools-toolbox">Developer tools toolbox</a></li> <li><a href="#debugging-background-scripts">Debugging background scripts</a></li> <li><a href="#debugging-options-pages">Debugging options pages</a></li> <li><a href="#debugging-popups">Debugging popups</a></li> <li><a href="#debugging-content-scripts">Debugging content scripts</a></li> <li><a href="#debugging-sidebars">Debugging sidebars</a></li> <li><a href="#debugging-storage">Debugging storage</a></li> <li><a href="#debugging-developer-tools-pages-and-panels">Debugging developer tools pages and panels</a></li> <li><a href="#debug-permission-requests">Debug permission requests</a></li> <li><a href="#debugging-browser-restarts">Debugging browser restarts</a></li> </ul> </li> <li> <a href="/documentation/develop/temporary-installation-in-firefox/">Temporary Installation in Firefox</a><ul class="section"> <li><a href="#reloading-a-temporary-extension">Reloading a temporary extension</a></li> <li><a href="#using-the-command-line">Using the command line</a></li> <li><a href="#detecting-temporary-installation">Detecting temporary installation</a></li> <li><a href="#limitations">Limitations</a></li> </ul> </li> <li> <a href="/documentation/develop/testing-persistent-and-restart-features/">Testing persistent and restart features</a><ul class="section"> <li><a href="#what-is-an-add-on-id">What is an add-on ID?</a></li> <li><a href="#what-is-a-firefox-profile">What is a Firefox profile?</a></li> <li><a href="#extension-behavior-in-firefox">Extension behavior in Firefox</a></li> <li><a href="#what-do-i-do-to-ensure-i-can-test-my-extension">What do I do to ensure I can test my extension?</a></li> </ul> </li> <li> <a href="/documentation/develop/test-permission-requests/">Test permission requests</a><ul class="section"> <li><a href="#permission-grant-behavior-during-testing">Permission grant behavior during testing</a></li> <li><a href="#observe-or-verify-install-time-permission-requests">Observe or verify install time permission requests</a></li> <li><a href="#retest-runtime-permission-grants">Retest runtime permission grants</a></li> </ul> </li> <li> <a href="/documentation/develop/known-issues/">Known issues</a><ul class="section"> <li><a href="#invisible-content-scripts">Content scripts don't appear in DevTools</a></li> <li><a href="#devtools-updates-missing">Extension source don't update in DevTools</a></li> <li><a href="#android-destroyed-actor">"Destroyed actor" errors when debugging Android</a></li> </ul> </li> </ul> </div> </li> <li class="has-children"> <a href="/documentation/publish/" data-overviewtitle="Publish Overview">Publish</a> <ul class="section"> <li><a href="#get-your-extension-signed">Get your extension signed</a></li> <li><a href="#distribute-your-signed-extension">Distribute your signed extension</a></li> <li><a href="#promote-your-extension">Promote your extension</a></li> </ul> <div class="category"> <h6>Policies</h6> <ul> <li> <a href="/documentation/publish/add-on-policies/">Add-on Policies</a><ul class="section"> <li><a href="#no-surprises">No Surprises</a></li> <li><a href="#content">Content</a></li> <li><a href="#submission-guidelines">Submission Guidelines</a></li> <li><a href="#development-practices">Development Practices</a></li> <li><a href="#data-disclosure-collection-and-management">Data Disclosure, Collection and Management</a></li> <li><a href="#monetization">Monetization</a></li> <li><a href="#security-compliance-and-blocking">Security, Compliance and Blocking</a></li> </ul> </li> <li> <a href="/documentation/publish/firefox-add-on-distribution-agreement/">Firefox Add-on Distribution Agreement</a><ul class="section"> <li><a href="#introduction">1. Introduction</a></li> <li><a href="#accounts">2. Accounts</a></li> <li><a href="#privacy-policy">3. Privacy Policy</a></li> <li><a href="#distribution-certificates-and-review-process">4. Distribution, certificates, & review process</a></li> <li><a href="#your-obligations">5. Your obligations</a></li> <li><a href="#licenses-proprietary-rights">6. Licenses; proprietary rights</a></li> <li><a href="#content-removal">7. Content removal</a></li> <li><a href="#disclaimer-of-warranties">8. Disclaimer of warranties</a></li> <li><a href="#limitation-of-liability">9. Limitation of liability</a></li> <li><a href="#release-idemnification">10. Release; indemnification</a></li> <li><a href="#general-legal-terms">11. General legal terms</a></li> </ul> </li> <li> <a href="/documentation/publish/add-ons-blocking-process/">Add-ons Blocking Process</a><ul class="section"> <li><a href="#security-over-choice">Security Over Choice</a></li> <li><a href="#blocking-criteria">Blocking Criteria</a></li> <li><a href="#developer-outreach">Developer Outreach</a></li> <li><a href="#requesting-a-block">Requesting a Block</a></li> <li><a href="#blocking-other-types-of-third-party-software">Blocking Other Types of Third Party Software</a></li> </ul> </li> <li> <a href="/documentation/publish/third-party-library-usage/">Third Party Library Usage</a><ul class="section"> <li><a href="#when-must-links-for-third-party-libraries-be-provided">When must links for third-party libraries be provided?</a></li> <li><a href="#how-to-determine-the-third-party-library-link">How to determine the third-party library link</a></li> <li><a href="#communicating-third-party-library-links-to-the-reviewer">Communicating third-party library links to reviewers</a></li> </ul> </li> <li> <a href="/documentation/publish/what-does-review-rejection-mean-to-users/">What does review rejection mean to users?</a><ul class="section"> <li><a href="#review-overview">Review overview</a></li> <li><a href="#impact-of-review-rejection">Impact of review rejection</a></li> <li><a href="#blocklisting">Blocklisting</a></li> </ul> </li> </ul> </div> <div class="category"> <h6>Sign</h6> <ul> <li> <a href="/documentation/publish/signing-and-distribution-overview/">Signing and distribution overview</a><ul class="section"> <li><a href="#signing-your-addons">Signing your add-ons</a></li> <li><a href="#distributing-your-addon">Distributing your add-on</a></li> <li><a href="#post-submission-review">Post-submission review</a></li> <li><a href="#about-amo">More information about AMO</a></li> </ul> </li> <li> <a href="/documentation/publish/package-your-extension/">Package your extension</a><ul class="section"> <li><a href="#package-windows">Windows</a></li> <li><a href="#package-mac">Mac OSX</a></li> <li><a href="#package-linux">Linux / Mac OSX Terminal</a></li> </ul> </li> </ul> </div> <div class="category"> <h6>Distribute</h6> <ul> <li> <a href="/documentation/publish/distribute-manifest-versions/">Distribute Manifest V2 and V3 extensions</a> </li> <li> <a href="/documentation/publish/distribute-pre-release-versions/">Distribute pre-release versions</a> </li> <li> <a href="/documentation/publish/submitting-an-add-on/">Submitting an add-on</a><ul class="section"> <li><a href="#listing-on-amo">Listing on AMO</a></li> <li><a href="#self-distribution">Self-distribution</a></li> <li><a href="#get-help">Get help</a></li> </ul> </li> <li> <a href="/documentation/publish/source-code-submission/">Source code submission</a><ul class="section"> <li><a href="#provide-your-extension-source-code">Provide your extension source code</a></li> <li><a href="#default-reviewer-build-environment">Default reviewer build environment</a></li> <li><a href="#use-of-obfuscated-code">Use of obfuscated code</a></li> <li><a href="#source-code-checklist">Source code checklist</a></li> </ul> </li> <li> <a href="/documentation/publish/version-compatibility/">Firefox version compatibility</a><ul class="section"> <li><a href="#compatibility">Version compatibility</a></li> <li><a href="#browser-specific-settings">The `browser_specific_settings` key</a></li> <li><a href="#amo-compatibility">AMO compatibility setting</a></li> <li><a href="#recommendations">Recommendations</a></li> </ul> </li> <li> <a href="/documentation/publish/add-on-ownership/">Add-on ownership</a><ul class="section"> <li><a href="#transfer-ownership">Transfer ownership</a></li> <li><a href="#code-disputes">Code disputes</a></li> </ul> </li> <li> <a href="/documentation/publish/developer-accounts/">Developer accounts</a><ul class="section"> <li><a href="#setting-a-display-name">Setting a display name</a></li> <li><a href="#blocked-accounts">Blocked accounts</a></li> <li><a href="#email-issues">Issues receiving emails from AMO</a></li> </ul> </li> <li> <a href="/documentation/publish/self-distribution/">Self-distribution</a><ul class="section"> <li><a href="#options">Self-distribution options</a></li> </ul> </li> <li> <a href="/documentation/publish/distribute-sideloading/">Sideloading</a><ul class="section"> <li><a href="#preparing-your-addon">Preparing your add-on</a></li> <li><a href="#install-addon-from-file">Install add-on from file</a></li> <li><a href="#standard-extension-folders">Installation using the standard extension folders</a></li> </ul> </li> <li> <a href="/documentation/publish/distribute-for-desktop-apps/">For desktop apps</a> </li> </ul> </div> <div class="category"> <h6>Promote</h6> <ul> <li> <a href="/documentation/develop/create-an-appealing-listing/">Create an appealing listing</a><ul class="section"> <li><a href="#your-add-ons-name">Your add-on’s name</a></li> <li><a href="#create-a-captivating-icon">Create a captivating icon</a></li> <li><a href="#create-a-meaningful-set-of-keywords">Create a meaningful set of keywords</a></li> <li><a href="#make-sure-your-summary-is-just-long-enough">Make sure your summary is just long enough</a></li> <li><a href="#focus-on-key-features-in-your-screenshots">Focus on key features in your screenshots</a></li> <li><a href="#the-add-on-description-can-be-longer-but-not-too-long">The add-on description can be longer, but not too long</a></li> <li><a href="#make-it-local">Make it local</a></li> <li><a href="#make-it-experimental">Make it experimental</a></li> <li><a href="#select-the-right-platforms-and-versions">Select the right platforms and versions</a></li> <li><a href="#categorize-well">Categorize well</a></li> <li><a href="#be-prepared-to-provide-support">Be prepared to provide support</a></li> <li><a href="#set-up-a-developer-profile">Set up a developer profile</a></li> <li><a href="#use-plain-language-in-any-privacy-policy-or-license-agreement">Use plain language in any privacy policy or license agreement</a></li> <li><a href="#gently-ask-for-a-review">Gently ask for a review</a></li> <li><a href="#make-use-of-markdown">Make use of Markdown</a></li> <li><a href="#some-other-points">Some other points</a></li> </ul> </li> <li> <a href="https://www.youtube.com/watch?v=a0_OsLGI0k4">What’s great content and design?</a> </li> <li> <a href="/documentation/publish/promoting-your-extension/">Promoting your extension</a><ul class="section"> <li><a href="#promote-your-addon">Promote your add-on from your website</a></li> <li><a href="#friends-family-colleagues">Friends, family, and colleagues</a></li> <li><a href="#events-and-meetups">Events and meetups</a></li> <li><a href="#current-users">Current users</a></li> <li><a href="#social-media">Social media</a></li> <li><a href="#engage-with-users">Engage with your users</a></li> <li><a href="#create-a-forum">Create a forum, user group, or similar</a></li> <li><a href="#engage-with-media">Engage with bloggers and news media</a></li> <li><a href="#advertising">Advertising</a></li> </ul> </li> <li> <a href="/documentation/publish/make-money-from-browser-extensions/">Make money from browser extensions</a><ul class="section"> <li><a href="#sell-through-AMO">Will I ever be able to sell through AMO?</a></li> <li><a href="#what-cant-you-do">What can't you do</a></li> <li><a href="#what-can-you-do">What can you do</a></li> <li><a href="#unsolicited-offers">Unsolicited offers</a></li> <li><a href="#maximize-income">How can I maximize my income?</a></li> </ul> </li> <li> <a href="/documentation/publish/recommended-extensions/">Recommended extensions</a><ul class="section"> <li><a href="#overview">Overview</a></li> <li><a href="#criteria">Criteria for Recommended extensions</a></li> <li><a href="#partnership">Developer partnership</a></li> <li><a href="#selection">Selection process</a></li> </ul> </li> </ul> </div> </li> <li class="has-children"> <a href="/documentation/manage/" data-overviewtitle="Manage Overview">Manage</a> <ul class="section"> <li><a href="#stay-informed-when-firefox-changes">Stay informed when Firefox changes</a></li> <li><a href="#publish-extension-updates">Publish extension updates</a></li> <li><a href="#manage-authors-of-your-extension">Manage authors of your extension</a></li> <li><a href="#promote-your-extension">Promote your extension</a></li> <li><a href="#removing-your-extension-from-distribution">Removing your extension from distribution</a></li> </ul> <div class="category"> <h6>Resources</h6> <ul> <li> <a href="/documentation/manage/updating-your-extension/">Updating your extension</a><ul class="section"> <li><a href="#enable-update">Enabling updates to your extension</a></li> <li><a href="#manifest-structure">Manifest structure</a></li> <li><a href="#testing-automatic-updating">Testing automatic updating</a></li> </ul> </li> <li> <a href="/documentation/manage/best-practices-for-updating/">Best practices for updating your extension</a> </li> <li> <a href="/documentation/manage/monitoring-extension-usage-statistics/">Monitoring extension usage statistics</a><ul class="section"> <li><a href="#accessing-the-statistics-dashboard">Accessing the statistics dashboard</a></li> <li><a href="#tracking-external-sources">Tracking external sources</a></li> <li><a href="#add-on-listing-example">Add-on listing example</a></li> </ul> </li> <li> <a href="/documentation/manage/resources-for-publishers/">Resources for publishers</a> </li> <li> <a href="/documentation/manage/retiring-your-extension/">Retiring your extension</a><ul class="section"> <li><a href="#reasons-for-withdrawing">Reasons for withdrawing your extension</a></li> <li><a href="#steps-to-retiring-an-extension">Steps to retiring an extension</a></li> <li><a href="#suggested-retirement-timetable">Suggested retirement timetable</a></li> </ul> </li> </ul> </div> </li> <li class="has-children"> <a href="/documentation/enterprise/" data-overviewtitle="Enterprise Overview">Enterprise</a> <ul class="section"> <li><a href="#developing-your-enterprise-extension">Developing your enterprise extension</a></li> <li><a href="#distributing-your-enterprise-extension">Distributing your enterprise extension</a></li> </ul> <div class="category"> <h6>Enterprise support</h6> <ul> <li> <a href="https://support.mozilla.org/products/firefox-enterprise/policies-customization-enterprise/manage-add-ons-enterprise">Manage add-ons for Firefox for Enterprise</a> </li> <li> <a href="https://support.mozilla.org/kb/install-system-add-ons-firefox-enterprise">Install system add-ons for Firefox for Enterprise</a> </li> </ul> </div> <div class="category"> <h6>Enterprise resources</h6> <ul> <li> <a href="/documentation/enterprise/enterprise-development/">Enterprise development</a><ul class="section"> <li><a href="#enterprise-consent">Data collection disclosure and consent for enterprise extensions</a></li> <li><a href="#how-to-add-policy">How to add policy support</a></li> <li><a href="#distributing-your-policy">Distributing your policy</a></li> </ul> </li> <li> <a href="/documentation/enterprise/enterprise-policies-that-impact-extensions/">Enterprise policies that impact extensions</a><ul class="section"> <li><a href="#relevant-policies">Relevant policies</a></li> <li><a href="#other-relevant-policies">Other relevant policies</a></li> </ul> </li> <li> <a href="/documentation/enterprise/enterprise-distribution/">Enterprise distribution</a><ul class="section"> <li><a href="#signed-vs-unsigned">Signed vs. unsigned extensions</a></li> <li><a href="#using-an-extensionsettings-policy">Using an ExtensionSettings policy</a></li> <li><a href="#bundling-add-ons-with-custom-Firefox">Bundling add-ons with a custom Firefox</a></li> </ul> </li> </ul> </div> </li> <li class="has-children"> <a href="/documentation/themes/" data-overviewtitle="Themes Overview">Themes</a> <div class="category"> <h6>Creating themes</h6> <ul> <li> <a href="/documentation/themes/using-the-amo-theme-generator/">Using the AMO theme generator</a><ul class="section"> <li><a href="#getting-started">Getting started</a></li> <li><a href="#submitting-your-theme">Submitting your theme</a></li> <li><a href="#updating-your-theme">Updating your theme</a></li> </ul> </li> <li> <a href="/documentation/themes/static-themes/">Static themes</a><ul class="section"> <li><a href="#introduction">Introduction</a></li> <li><a href="#create-a-simple-static-theme">Create a simple static theme</a></li> <li><a href="#updating-static-themes">Updating static themes</a></li> <li><a href="#single-image-themes">Single image themes</a></li> <li><a href="#multiple-image-themes">Multiple image themes</a></li> <li><a href="#static-animated-themes">Static animated themes</a></li> </ul> </li> <li> <a href="/documentation/themes/dynamic-themes/">Dynamic themes</a><ul class="section"> <li><a href="#introduction">Introduction</a></li> <li><a href="#creating-dynamic-themes">Creating dynamic themes</a></li> <li><a href="#publishing-dynamic-themes">Publishing dynamic themes</a></li> </ul> </li> <li> <a href="/documentation/themes/cross-browser-compatibility/">Cross-browser compatibility</a> </li> </ul> </div> </li> </ul> </li><li class="has-children"> <a href="/community/" data-overviewtitle="Community Overview">Community</a> <ul class="section"> <li><a href="#who-is-part-of-the-community">Who is part of the community?</a></li> <li><a href="#connect-with-the-community">Connect with the community</a></li> <li><a href="#get-involved-in-the-community">Get involved in the community</a></li> </ul> <div class="category"> <h6>Get in touch</h6> <ul> <li> <a href="https://discourse.mozilla.org/c/add-ons">Community Forum</a> </li> <li> <a href="https://blog.mozilla.org/addons/">Add-ons Blog</a> </li> <li> <a href="/community/#office-hours">Office Hours</a> </li> <li> <a href="https://stackoverflow.com/tags/firefox-addon">Stack Overflow</a> </li> <li> <a href="https://calendar.google.com/calendar?cid=bW96aWxsYS5jb21fb2ZqbGN0MDdrMTc4NHYxdTUxYnFrNDc2YmtAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ">Communication Calendar</a> </li> <li> <a href="https://mail.mozilla.org/listinfo/dev-addons">Dev Mailing List</a> </li> </ul> </div><div class="category"> <h6>Contribute</h6> <ul> <li> <a href="https://wiki.mozilla.org/Add-ons/Contribute">Contribution opportunities</a> </li> <li> <a href="https://wiki.mozilla.org/WebExtensions/Contribution_Onramp">Onboard to the WebExtensions codebase</a> </li> <li> <a href="https://wiki.mozilla.org/WebExtensions/Hacking">Hacking guide for WebExtensions code contributions</a> </li> <li> <a href="https://webextensions-experiments.readthedocs.io/">WebExtensions Experiments</a> </li> <li> <a href="https://bugzilla.mozilla.org">Find or create a bug</a> </li> </ul> </div> </li> </ul> </div> </nav> <div class="site-content"> <main class="site-content-body" aria-label="Content">  <section class="page-hero"> <div class="module"> <article class="module-content grid-x grid-padding-x"> <div class="cell small-12"> <div class="page-hero-description"> <p class="section-title"><small></small></p> <h1>Manifest V3 migration guide</h1> <p>Manifest V3 became generally available in Firefox 109 after being available as a developer preview from Firefox 101. This page details what's changed and how you adapt your extensions to take advantage of Manifest V3.</p> <p>See the <a href="/documentation/develop/developing-extensions-for-firefox-for-android/#mv3-compatibility">Developing extensions for Firefox for Android</a> page for additional guidance if you plan to support Firefox for Android.</p> </div> <div class="page-hero-cta"> </div> </div> </article> </div> </section>   <section id="what-is-manifest-v3" class="module"> <aside class="module-aside table-of-contents"><div class="table-of-contents-inner"> <h6>Contents</h6> <ol><li><a href="#what-is-manifest-v3">What is Manifest V3?</a></li><li><a href="#developer-preview-changes">Manifest V3 changes</a></li><li><a href="#migration-checklist">Migration checklist</a></li> </ol> </div> </aside> <article class="module-content grid-x grid-padding-x"> <div class="cell small-12"> <h2>What is Manifest V3?</h2> <p>Manifest V3 (MV3) is the umbrella term for several foundational changes to the WebExtensions API in Firefox. The name refers to the declared <code>manifest_version</code> key in each extension’s <a href="https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json">manifest.json</a> file.</p> <p>The Manifest V3 changes apply to extensions for Safari, Firefox, and Chromium-based browsers – such as Chrome, Edge, and Opera. While the goal is to maintain a high degree of compatibility between the Firefox, Safari, and Chromium extension platforms, our implementation diverges where we think it matters and where our values point to a different direction.</p> <p>This article discusses the changes introduced with Manifest V3 in Firefox and highlights where they diverge from the Chrome and Safari implementation.</p> </div> </article> </section>   <section id="developer-preview-changes" class="module"> <article class="module-content grid-x grid-padding-x"> <div class="cell small-12"> <h2>Manifest V3 changes</h2> <p>This section details the Manifest V3 changes made to Firefox.</p> </div> </article> </section> <section id="manifest-version" class="module"> <article class="module-content grid-x grid-padding-x"> <div class="cell small-12"> <h3>Manifest version</h3> <p>The manifest.json key <a href="https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/manifest_version"><code>manifest_version</code></a> accepts <code>3</code>. To use Manifest V3, update your manifest.json file like this:</p> <pre class="language-json"><code class="language-json"><span class="token property">"manifest_version"</span><span class="token operator">:</span> <span class="token number">3</span></code></pre> </div> </article> </section> <section id="search-extensions-icons" class="module"> <article class="module-content grid-x grid-padding-x"> <div class="cell small-12"> <h3>Search extensions icons</h3> <p>Search extensions must use local icons. This change prevents the unnecessary network pings that result from accessing remote icons.</p> <p>To accommodate this change, provide a local icon and define it in your manifest.json <a href="https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/chrome_settings_overrides">chrome_settings_overrides</a> manifest key like this:</p> <pre class="language-json"><code class="language-json"><span class="token property">"chrome_settings_overrides"</span><span class="token operator">:</span> <span class="token punctuation">{</span> <span class="token property">"search_provider"</span><span class="token operator">:</span> <span class="token punctuation">{</span> <span class="token property">"name"</span><span class="token operator">:</span> <span class="token string">"Search engine"</span><span class="token punctuation">,</span> <span class="token property">"search_url"</span><span class="token operator">:</span> <span class="token string">"https://www.searchengine.com/search/?q={searchTerms}"</span><span class="token punctuation">,</span> <span class="token property">"keyword"</span><span class="token operator">:</span> <span class="token string">"search"</span><span class="token punctuation">,</span> <span class="token property">"favicon_url"</span><span class="token operator">:</span> <span class="token string">"/imager/favicon.ico"</span> <span class="token punctuation">}</span> <span class="token punctuation">}</span></code></pre> </div> </article> </section> <section id="host-permissions" class="module"> <article class="module-content grid-x grid-padding-x"> <div class="cell small-12"> <h3>Host permissions</h3> <p>In Manifest V2, host permissions are defined in the manifest.json keys <code>permissions</code> or <code>optional_permissions</code>. The host permissions defined in the manifest.json keys <code>permissions</code> are displayed to the user on installation and granted to the extension permanently.</p> <p>In Manifest V3, host permissions are defined in the <a href="https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/host_permissions"><code>host_permissions</code></a> and <a href="https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/optional_host_permissions"><code>optional_host_permissions</code></a> keys. With Manifest V3 extensions, users can grant or revoke any host permissions on an ad hoc basis.</p> <p>Up to Firefox 126, Manifest V3 host permissions were not granted on installation and were not displayed to the user. From Firefox 127, host permissions listed in <code>host_permissions</code> and <code>content_scripts</code> are displayed in the install prompt and granted on installation. However, if an extension update grants new host permissions, these are not shown to the user (see <a href="https://bugzil.la/1893232">Firefox bug 1893232</a>).</p> <p>As users can revoke host permissions, your extension should check for the availability of any expected host permissions and request them if necessary.</p> <p>See <a href="https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/host_permissions#requested_permissions_and_user_prompts">Requested permissions and user prompts</a> in the <code>host_permissions</code> documentation for more information.</p> <p>Move all host permission specifications to the manifest.json key <code>host_permissions</code> like this:</p> <pre class="language-json"><code class="language-json"><span class="token property">"permissions"</span><span class="token operator">:</span> <span class="token punctuation">[</span> <span class="token string">"tabs"</span><span class="token punctuation">,</span> <span class="token string">"notifications"</span> <span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token property">"optional_permissions"</span><span class="token operator">:</span> <span class="token punctuation">[</span> <span class="token string">"geolocation"</span> <span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token property">"host_permissions"</span><span class="token operator">:</span> <span class="token punctuation">[</span> <span class="token string">"http://www.mysite.com/"</span><span class="token punctuation">,</span> <span class="token string">"*://*.example.org/*"</span> <span class="token punctuation">]</span></code></pre> </div> </article> </section> <section id="browser-action" class="module"> <article class="module-content grid-x grid-padding-x"> <div class="cell small-12"> <h3>Browser action</h3> <p>The features available under the manifest.json key <code>browser_action</code> and the <code>browserAction</code> API have moved to a new <code>action</code> <a href="https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/action">key</a> and <a href="https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/action">API</a>. Also, the <code>_execute_action</code> <a href="https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/commands#special_shortcuts">special shortcut</a> is introduced.</p> <p>As the old and new key and API are otherwise identical, the changes needed are relatively straightforward and are as follows:</p> <ul> <li>rename the manifest.json key 'browser_action' to 'action' and remove any reference to <a href="#browser-style"><code>browser_style</code></a>, like this:<pre class="language-json"><code class="language-json"><span class="token property">"action"</span><span class="token operator">:</span> <span class="token punctuation">{</span> <span class="token property">"default_icon"</span><span class="token operator">:</span> <span class="token punctuation">{</span> <span class="token property">"16"</span><span class="token operator">:</span> <span class="token string">"button/geo-16.png"</span><span class="token punctuation">,</span> <span class="token property">"32"</span><span class="token operator">:</span> <span class="token string">"button/geo-32.png"</span> <span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token property">"default_title"</span><span class="token operator">:</span> <span class="token string">"Whereami?"</span><span class="token punctuation">,</span> <span class="token property">"default_popup"</span><span class="token operator">:</span> <span class="token string">"popup/geo.html"</span><span class="token punctuation">,</span> <span class="token property">"theme_icons"</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token punctuation">{</span> <span class="token property">"light"</span><span class="token operator">:</span> <span class="token string">"icons/geo-16-light.png"</span><span class="token punctuation">,</span> <span class="token property">"dark"</span><span class="token operator">:</span> <span class="token string">"icons/geo-16.png"</span><span class="token punctuation">,</span> <span class="token property">"size"</span><span class="token operator">:</span> <span class="token number">16</span> <span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token punctuation">{</span> <span class="token property">"light"</span><span class="token operator">:</span> <span class="token string">"icons/geo-32-light.png"</span><span class="token punctuation">,</span> <span class="token property">"dark"</span><span class="token operator">:</span> <span class="token string">"icons/geo-32.png"</span><span class="token punctuation">,</span> <span class="token property">"size"</span><span class="token operator">:</span> <span class="token number">32</span> <span class="token punctuation">}</span><span class="token punctuation">]</span> <span class="token punctuation">}</span></code></pre> </li> <li>update API references from <code>browser.browserAction</code> to <code>browser.action</code>.</li> <li>if used, change <code>_execute_browser_action</code> to <code>_execute_action</code> in the <code>commands</code> manifest key and in the <a href="https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/menus/create"><code>menu.create</code></a> and <a href="https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/menus/update"><code>menu.update</code></a> API methods (or their aliases <code>contextMenus.create</code> and <code>contextMenus.update</code>).</li> </ul> <div class="note"> <p>If the user changes the shortcut of the <code>_execute_browser_action</code> command, it is automatically carried over to the <code>_execute_action</code> command when an extension migrates from Manifest V2 to V3. This was implemented in Chrome 111 and Firefox 127.</p> </div> <div class="note"> <p>In Chromium and Safari, the Browser Action and Page Action APIs are unified into the Action API, <code>page_action</code> is merged into the renamed <code>action</code> key, and the <code>_execute_page_action</code> special shortcut is replaced by <code>_execute_action</code>. Firefox retains the page action API, key, and special shortcut.</p> </div> </div> </article> </section> <section id="browser-style" class="module"> <article class="module-content grid-x grid-padding-x"> <div class="cell small-12"> <h3><code>browser_style</code></h3> <p>In Manifest Version 3, <code>browser_style: true</code> is no longer supported in the <a href="https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/options_ui">options_ui</a>, <a href="https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/action">action</a>, <a href="https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/page_action">page_action</a>, and <a href="https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/sidebar_action">sidebar_action</a> manifest keys.</p> <p>The goal of this property was to enable extension UI components to take on the browser's style. However, it only partially worked as intended. As a consequence, it has been deprecated for Manifest V3. Therefore, remove any references from the manifest keys.</p> <p>In Manifest Version 2, <code>browser_style</code> defaults to <code>true</code> for <code>options_ui</code> and <code>sidebar_action</code>. Therefore, unless you had set <code>"browser_style": false</code>, confirm that the appearance of <code>options_ui</code> and <code>sidebar_action</code> match your intended design.</p> <p>See <a href="https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface/Browser_styles#manifest_v3_migration">Manifest V3 migration for <code>browser_style</code></a> for more information.</p> </div> </article> </section> <section id="scripting-api" class="module"> <article class="module-content grid-x grid-padding-x"> <div class="cell small-12"> <h3>Scripting API</h3> <p>The <a href="https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/scripting">Scripting API</a> takes over the features of <code>tabs.insertCSS()</code>, <code>tabs.removeCSS()</code>, and <code>tabs.executeScript()</code> and adds capabilities to register, update, and unregister content scripts at runtime.</p> <p>Also, the <code>code</code> parameter is removed so that arbitrary strings can no longer be executed. This API requires the <a href="https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/permissions"><code>scripting</code> permission</a>. So, you need to move any arbitrary strings executed as scripts to files and rewrite your code to use the Scripting API.</p> </div> </article> </section> <section id="event-driven-background-scripts" class="module"> <article class="module-content grid-x grid-padding-x"> <div class="cell small-12"> <h3>Event-driven background scripts</h3> <p>Firefox has extended support for <a href="https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/Background_scripts">background scripts</a> by enabling non-persistent background pages (aka Event Pages) for Manifest V2 and V3. Using non-persistent background scripts greatly reduces your extension use of browser resources. However, MV3 removes support for persistent background pages.</p> <p>To migrate your extension to using non-persistent background pages, you need to:</p> <ul> <li>Update your manifest.json <code>background</code> key to remove the <code>"persistent"</code> property or set it to <code>false</code>. This feature is also supported in MV2 from Firefox 106.</li> <li>Ensure listeners are at the top-level and use the synchronous pattern.</li> <li>Record state changes in local storage.</li> <li>Change timers to alarms.</li> <li>Switch from using <a href="https://developer.mozilla.org/en-US/Mozilla/Add-ons/WebExtensions/API/extension/getBackgroundPage"><code>extension.getBackgroundPage</code></a> to call a function from the background page, to <a href="https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/runtime/getBackgroundPage"><code>runtime.getBackgroundPage</code></a>.</li> <li>Place menu creation using <a href="https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/API/menus/create"><code>menus.create</code></a> or its alias <code>contextMenus.create</code> in a <code>runtime.onInstalled</code> listener. Also, note that the <a href="https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/menus/onClicked"><code>menus.onClicked</code></a> event or its alias <code>contextMenus.onClicked</code> must be used to handle menu entry click events from an event page, instead of the <code>onclick</code> parameter of the <code>contextMenus.create</code> or <code>contextMenus.update</code> methods. If the <code>onclick</code> property of <code>menus.create</code> or its alias <code>contextMenus.create</code> are used from a call originating from an event page, they throw synchronously.</li> </ul> <div class="note"> <p>Safari also supports event-driven background scripts, however, Chromium has adopted service workers instead.</p> </div> <div class="note"> <p>Firefox supports non-persistent background pages from Firefox 106. In Firefox 105 and earlier, event pages are run as if they are a persistent background page.</p> </div> <p>More information on the migration process can be found on the <a href="https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/Background_scripts">background script</a> page on MDN.</p> </div> </article> </section> <section id="event-pages-and-backward-compatibility" class="module"> <article class="module-content grid-x grid-padding-x"> <div class="cell small-12"> <h4>Event pages and backward-compatibility</h4> <div class="note"> <p>This section is only relevant if your extension supports Firefox 105 and earlier.</p> </div> <p>An extension designed as a non-persistent background page works even when event pages are not supported (i.e., in Firefox 105 and earlier) with one exception: the registration of context menus. In an event page, context menus persist across restarts, while they do not in persistent background pages.</p> <p>If the recommendation to register menus in <code>runtime.onInstalled</code> is followed, these menus are removed after a browser restart in Firefox 105 and earlier. To work around this issue, you could unconditionally call <code>browser.contextMenus.create</code>. When the menu exists, the <code>browser.runtime.lastError</code> property is set when the (optional) <code>create</code> callback is called.</p> <pre class="language-javascript"><code class="language-javascript">browser<span class="token punctuation">.</span>contextMenus<span class="token punctuation">.</span><span class="token function">create</span><span class="token punctuation">(</span> <span class="token punctuation">{</span> <span class="token literal-property property">id</span><span class="token operator">:</span> <span class="token string">"my-menu"</span><span class="token punctuation">,</span> <span class="token comment">// etc.</span> <span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span> <span class="token comment">// TODO: Do not forget to read the "browser.runtime.lastError" property to</span> <span class="token comment">// avoid warnings about an uncaught error when the menu item was created</span> <span class="token comment">// before ("ID already exists: my-menu").</span> <span class="token punctuation">}</span> <span class="token punctuation">)</span><span class="token punctuation">;</span></code></pre> <p>If the initialization of the menu is expensive or requires complex logic, an alternative is to check whether event pages are supported and, if so, run the logic less frequently than at every wakeup of the event page (e.g., with <a href="https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/runtime/onInstalled"><code>runtime.onInstalled</code></a> or <a href="https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/runtime/onStartup"><code>runtime.onStartup</code></a>).</p> <p>You can detect the availability of event pages using the characteristic that an error is thrown synchronously when <code>onclick</code> is passed to <code>contextMenus.create</code> in an event page.</p> <p>The following code shows how to use such a test to register menus.</p> <pre class="language-javascript"><code class="language-javascript"><span class="token keyword">let</span> eventPagesSupported <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span> <span class="token keyword">try</span> <span class="token punctuation">{</span> <span class="token comment">// Firefox throws a synchronous error when onclick is passed in an event page.</span> browser<span class="token punctuation">.</span>contextMenus<span class="token punctuation">.</span><span class="token function">create</span><span class="token punctuation">(</span><span class="token punctuation">{</span> <span class="token literal-property property">id</span><span class="token operator">:</span> <span class="token string">"test-menu"</span><span class="token punctuation">,</span> <span class="token function-variable function">onclick</span><span class="token operator">:</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span><span class="token punctuation">}</span> <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span> eventPagesSupported <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span> browser<span class="token punctuation">.</span>contextMenus<span class="token punctuation">.</span><span class="token function">remove</span><span class="token punctuation">(</span><span class="token string">"test-menu"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span>err<span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token comment">// Firefox 106+ error: Property "onclick" cannot be used in menus.create, replace with an "onClicked" event listener.</span> <span class="token punctuation">}</span> <span class="token keyword">async</span> <span class="token keyword">function</span> <span class="token function">registerMyMenus</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> browser<span class="token punctuation">.</span>contextMenus<span class="token punctuation">.</span><span class="token function">create</span><span class="token punctuation">(</span><span class="token punctuation">{</span> <span class="token literal-property property">id</span><span class="token operator">:</span> <span class="token string">"my-menu"</span><span class="token punctuation">,</span> <span class="token comment">/* etc. */</span> <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token punctuation">}</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>eventPagesSupported<span class="token punctuation">)</span> <span class="token punctuation">{</span> browser<span class="token punctuation">.</span>runtime<span class="token punctuation">.</span>onInstalled<span class="token punctuation">.</span><span class="token function">addListener</span><span class="token punctuation">(</span>registerMyMenus<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span> <span class="token function">registerMyMenus</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token punctuation">}</span></code></pre> </div> </article> </section> <section id="content-security-policies" class="module"> <article class="module-content grid-x grid-padding-x"> <div class="cell small-12"> <h3>Content security policies</h3> <p><a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP">Content security policy (CSP)</a> in the <a href="https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/manifest.json/content_security_policy"><code>content_security_policy</code></a> manifest.json key is changing to use the <code>extension_pages</code> property.</p> <p>Therefore, you need to move the extension’s CSP to the manifest.json key to <code>extension_pages</code>, like this:</p> <pre class="language-json"><code class="language-json"><span class="token property">"content_security_policy"</span><span class="token operator">:</span> <span class="token punctuation">{</span> <span class="token property">"extension_pages"</span><span class="token operator">:</span> <span class="token string">"default-src 'self'"</span> <span class="token punctuation">}</span></code></pre> <p>Manifest V3 has a more restrictive content security policy than Manifest V2, this may require further changes in your pages.</p> <p>Mozilla’s long-standing <a href="/documentation/publish/add-on-policies/">add-on policies</a> prohibit remote code execution. In keeping with these policies, the <a href="https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/manifest.json/content_security_policy">content_security_policy</a> field no longer supports sources permitting remote code in script-related directives, such as <code>script-src</code> or <code>’unsafe-eval’</code>. The only permitted values for the <code>script-src</code> directive are <code>’self’</code> and <code>’wasm-unsafe-eval’</code>. <code>’wasm-unsafe-eval’</code> must be specified in the CSP if an extension is to use WebAssembly. In Manifest V3, content scripts are subject to the same CSP as other parts of the extension.</p> <p>Historically, a custom extension CSP required <code>object-src</code> to be specified. This is not required in Manifest V3 (and was removed from Manifest V2 in Firefox 106). See <a href="https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/manifest.json/content_security_policy#object-src_directive"><code>object-src</code> in the <code>content_security_policy</code> documentation</a>). This change makes it easier for extensions to customize the CSP with minimal boilerplate.</p> </div> </article> </section> <section id="web-accessible-resources" class="module"> <article class="module-content grid-x grid-padding-x"> <div class="cell small-12"> <h3>Web Accessible Resources</h3> <p>Web accessible resources are available only to the sites and extensions specified in the manifest. In Manifest V3, Firefox supports the <code>extension_ids</code>, <code>matches</code>, and <code>resources</code> properties to specify the packaged resources you want to make available. Firefox does not support the <code>use_dynamic_url</code> property.</p> <p>To migrate your extension, rewrite the manifest.json key <a href="https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/web_accessible_resources">‘web_accessible_resources’</a> to specify the sites and extensions that can access the resources.</p> </div> </article> </section> <section id="features-already-supported-by-firefox" class="module"> <article class="module-content grid-x grid-padding-x"> <div class="cell small-12"> <h3>Features already supported by Firefox</h3> <p>As part of its Manifest V3 implementation, Chromium introduces <a href="https://developer.chrome.com/docs/extensions/mv3/intro/mv3-overview#promises">promise</a> support to many methods with the goal of eventually supporting promises on all appropriate methods. This will provide for greater compatibility between Firefox and Chrome extensions, given that Firefox already supports promises when using the <code>browser.*</code> namespace.</p> <p>In Manifest v2, Firefox extensions support the use of the <code>chrome.*</code> namespace with APIs that provide asynchronous event handling using callbacks. In Manifest V3, Firefox supports promises for asynchronous events in the <code>chrome.*</code> namespace.</p> </div> </article> </section> <section id="extension-version" class="module"> <article class="module-content grid-x grid-padding-x"> <div class="cell small-12"> <h3>Extension version in the manifest</h3> <p>The format of the top-level manifest.json <code>version</code> key in Firefox has evolved and became simpler: letters and other previously allowed symbols are no longer accepted. The value must be a string with 1 to 4 numbers separated by dots (e.g., <code>1.2.3.4</code>). Each number can have up to 9 digits and leading zeros before another digit are not allowed (e.g., <code>2.01</code> is forbidden, but <code>0.2</code>, <code>2.0.1</code>, and <code>2.1</code> are allowed).</p> </div> </article> </section> <section id="migration-checklist" class="module"> <article class="module-content grid-x grid-padding-x"> <div class="cell small-12"> <h2>Migration checklist</h2> <ul> <li>Update the manifest.json key <code>manifest_version</code> to <code>3</code>.</li> <li>If your extension adds a search engine, add a local icon and reference it in the manifest.json key <code>chrome_settings_overrides.search_provider.favicon_url</code>.</li> <li>Remove any host permissions from the manifest.json keys <code>permissions</code> and <code>optional_permissions</code> and add them to the <code>host_permissions</code> key. Remember that <code>host_permissions</code> is treated as an optional permission in Firefox and Safari but granted at install in Chrome.</li> <li>Remove references to <code>browser_style</code> from the manifest.json keys <code>browser_action</code>, <code>options_ui</code>, <code>page_action</code>, and <code>sidebar_action</code>.</li> <li>If <code>browser_style:false</code> was not specified in <code>options_ui</code> and <code>sidebar_action</code>, confirm that their appearance has not changed.</li> <li>Rename the manifest.json key <code>browser_action</code> to <code>action</code> and update any API references from <code>browser.browserAction</code> to <code>browser.action</code>.</li> <li>Convert background pages to be non-persistent.</li> <li>Move the extension’s CSP to the manifest.json key <code>content_security_policy.extension_pages</code> and update the CSP to conform to Manifest V3 requirements.</li> <li>Move any arbitrary strings executed as scripts to files and update your code to use the Scripting API.</li> <li>Rename the deprecated manifest.json key <code>applications</code> to <code>browser_specific_settings</code>.</li> <li>The add-on ID is required to publish your extension. Make sure to add one in the manifest.json key <code>browser_specific_settings.gecko.id</code>.</li> <li>Ensure that the top-level manifest.json key <code>version</code> is a string of numbers separated by up to 3 dots. For details, see <a href="https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/version/format">version format</a>.</li> </ul> </div> </article> </section>  <section class="module meta-data"> <article class="module-content grid-x grid-padding-x"> <div class="cell small-12"><p><span class="meta-label tags">Tags:</span>  <a href="/tags/webextensions/">webextensions</a>  <a href="/tags/api/">api</a>  <a href="/tags/firefox/">firefox</a> </p><p><span class="meta-label contributors">Contributors:</span> <a href="https://github.com/erosman/" title="View erosman on Github">erosman</a> <a href="https://github.com/Klestofer/" title="View Klestofer on Github">Klestofer</a> <a href="https://github.com/rebloor/" title="View rebloor on Github">rebloor</a> <a href="https://github.com/willdurand/" title="View willdurand on Github">willdurand</a> </p><p><span class="meta-label date">Last update:</span> <a href="https://github.com/rebloor/" title="View rebloor on Github" itemprop="author" itemscope="" itemtype="http://schema.org/Person"><span class="p-author h-card" itemprop="name">rebloor</span></a> <time class="dt-published" datetime="2023-03-03T00:00:00+00:00" itemprop="datePublished">Mar 03, 2023 </time> </p></div> </article> </section> <section class="module up-next"> <article class="module-content grid-x grid-padding-x"> <div class="cell small-12"> <h6>Up Next</h6> </div> <a href="/documentation/develop/browser-compatibility/" class="cell auto tile tile-block-link"> <div class="block-link"><p>Develop</p><h5>Browser compatibility</h5> </div> </a> <a href="/documentation/develop/browser-extension-development-tools/" class="cell auto tile tile-block-link"> <div class="block-link"><p>Develop</p><h5>Browser Extension Development Tools</h5> </div> </a> <a href="/documentation/develop/choosing-a-firefox-version-for-extension-development/" class="cell auto tile tile-block-link"> <div class="block-link"><p>Develop</p><h5>Choosing a Firefox version for extension development</h5> </div> </a> </article> </section> </main> <aside class="documentation-topics"> <div class="grid-container grid-x grid-padding-x"> <div class="cell small-12"> <h6>Documentation Topics</h6> <ul> <li><a href="/documentation/develop/">Develop</a></li> <li><a href="/documentation/publish/">Publish</a></li> <li><a href="/documentation/manage/">Manage</a></li> <li><a href="/documentation/enterprise/">Enterprise</a></li> <li><a href="/documentation/themes/">Themes</a></li> </ul> </div> </div> </aside> <aside class="panel social"> <div class="grid-container grid-x grid-padding-x"> <div class="cell small-12"> <h2>Connect With Us</h2> </div> <div class="cell small-12 large-3"> <h4>Twitter</h4> <p>For developers: <br><a href="https://twitter.com/mozamo" class="twitter">@mozamo</a></p> <p>For end users: <br><a href="https://twitter.com/rockyourfirefox" class="twitter">@rockyourfirefox</a></p> </div> <div class="cell small-12 large-4"> <h4>More</h4> <p><a href="https://wiki.mozilla.org/Matrix" class="irc">Matrix</a></p> <p><a href="https://discourse.mozilla.org/c/add-ons/" class="irc">Community forum</a></p> </div> <div class="cell small-12 large-5"> <h4>Extensions Developer Newsletter</h4> <p>Stay up-to-date on news and events for Firefox extension developers.</p> <div class="newsletter" id="newsletter_wrap">  <form id="newsletter_form" name="newsletter_form" action="https://www.mozilla.org/en-US/newsletter/" method="post" data-no-csrf=""> <input type="hidden" id="fmt" name="fmt" value="H"> <input type="hidden" id="newsletters" name="newsletters" value="about-addons"> <div id="newsletter-errors" class="newsletter-errors"></div> <div id="newsletter_email" class="form_group"> <label for="email" class="visually-hidden">Email Address</label> <input type="email" id="email" name="email" class="form_input" required="" placeholder="Email Address" size="30"> </div> <div id="newsletter_privacy" class="form_group form_group-agree"> <input type="checkbox" id="privacy" name="privacy" required=""> <label for="privacy">I’m okay with Mozilla handling my info as explained in this <a href="https://www.mozilla.org/privacy/websites/">Privacy Notice</a>.</label> </div> <div id="newsletter_submit"> <button type="submit" class="button btn btn-success">Sign up</button> </div> </form> <div id="newsletter-thanks" class="newsletter-thanks"> <h6>Thanks! 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Manifest V3 migration guide | Firefox Extension Workshop