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class="toggle"><details><summary>Getting started</summary><ol><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/What_are_WebExtensions">What are extensions?</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/Your_first_WebExtension">Your first extension</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/Your_second_WebExtension">Your second extension</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/Anatomy_of_a_WebExtension">Anatomy of an extension</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/Examples">Example extensions</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/What_next">What next?</a></li></ol></details></li><li class="toggle"><details><summary>Concepts</summary><ol><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API">JavaScript APIs</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/Content_scripts">Content scripts</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/Background_scripts">Background scripts</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/Match_patterns">Match patterns</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/Working_with_files">Work with files</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/Internationalization">Internationalization</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/Content_Security_Policy">Content Security Policy</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/Native_messaging">Native messaging</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/Differences_between_API_implementations">Differences between API implementations</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/Chrome_incompatibilities">Chrome incompatibilities</a></li></ol></details></li><li class="toggle"><details><summary>User interface</summary><ol><li><a 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href="/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface/devtools_panels">devtools panels</a></li></ol></details></li><li class="toggle"><details><summary>How to</summary><ol><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/Intercept_HTTP_requests">Intercept HTTP requests</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/Modify_a_web_page">Modify a web page</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/Safely_inserting_external_content_into_a_page">Insert external content</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/Sharing_objects_with_page_scripts">Share objects with page scripts</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/Add_a_button_to_the_toolbar">Add a button to the toolbar</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/Implement_a_settings_page">Implement a settings page</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/Working_with_the_Tabs_API">Work with the Tabs API</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/Work_with_the_Bookmarks_API">Work with the Bookmarks API</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/Work_with_the_Cookies_API">Work with the Cookies API</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/Work_with_contextual_identities">Work with contextual identities</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/Interact_with_the_clipboard">Interact with the clipboard</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/Extending_the_developer_tools">Extend the developer tools</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/Build_a_cross_browser_extension">Build a cross-browser extension</a></li></ol></details></li><li class="toggle"><details><summary>JavaScript APIs</summary><ol><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/Browser_support_for_JavaScript_APIs">Browser support for JavaScript APIs</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/action">action</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/alarms">alarms</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/bookmarks">bookmarks</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/browserAction">browserAction</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/browserSettings">browserSettings</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/browsingData">browsingData</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/captivePortal">captivePortal</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/clipboard">clipboard</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/commands">commands</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/contentScripts">contentScripts</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/contextualIdentities">contextualIdentities</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/cookies">cookies</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/declarativeNetRequest">declarativeNetRequest</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/devtools">devtools</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/dns">dns</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/dom">dom</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/downloads">downloads</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/events">events</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/extension">extension</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/extensionTypes">extensionTypes</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/find">find</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/history">history</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/i18n">i18n</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/identity">identity</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/idle">idle</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/management">management</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/menus">menus</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/notifications">notifications</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/omnibox">omnibox</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/pageAction">pageAction</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/permissions">permissions</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/pkcs11">pkcs11</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/privacy">privacy</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/proxy">proxy</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/runtime">runtime</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/scripting">scripting</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/search">search</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/sessions">sessions</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/sidebarAction">sidebarAction</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/storage">storage</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/tabs">tabs</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/theme">theme</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/topSites">topSites</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/types">types</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/userScripts">userScripts</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/userScripts_legacy">userScripts (Legacy)</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/webNavigation">webNavigation</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/webRequest">webRequest</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/windows">windows</a></li></ol></details></li><li class="toggle"><details open=""><summary>Manifest keys</summary><ol><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/action">action</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/author">author</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/background">background</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/browser_action">browser_action</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/browser_specific_settings">browser_specific_settings</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/chrome_settings_overrides">chrome_settings_overrides</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/chrome_url_overrides">chrome_url_overrides</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/commands">commands</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/content_scripts">content_scripts</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/content_security_policy">content_security_policy</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/declarative_net_request">declarative_net_request</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/default_locale">default_locale</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/description">description</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/developer">developer</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/devtools_page">devtools_page</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/dictionaries">dictionaries</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/externally_connectable">externally_connectable</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/homepage_url">homepage_url</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/host_permissions">host_permissions</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/icons">icons</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/incognito">incognito</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/manifest_version">manifest_version</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/name">name</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/offline_enabled">offline_enabled</a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/omnibox">omnibox</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/optional_host_permissions">optional_host_permissions</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/optional_permissions">optional_permissions</a></li><li><a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/options_page">options_page</a><abbr class="icon icon-deprecated" title="Deprecated. 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From Firefox 105 onwards, to enable other extensions to access an extension's resources they must be included in this key.</p> </div> <p>For example, the <a href="https://github.com/mdn/webextensions-examples/tree/main/beastify" class="external" target="_blank">Beastify example extension</a> replaces a web page with an image of a beast selected by the user. The beast images are packaged with the extension. To make the selected image visible, the extension adds <a href="/en-US/docs/Web/HTML/Element/img"><code><img></code></a> elements whose <code>src</code> attribute points to the beast's image. For the web page to be able to load the images, they must be made web accessible.</p> <p>With the <code>web_accessible_resources</code> key, you list all the packaged resources that you want to make available to web pages. You specify them as paths relative to the manifest.json file.</p> <p>Note that content scripts don't need to be listed as web accessible resources.</p> <p>If an extension wants to use <a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/webRequest"><code>webRequest</code></a> or <a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/declarativeNetRequest"><code>declarativeNetRequest</code></a> to redirect a public URL (e.g., HTTPS) to a page that's packaged in the extension, then the extension must list the page in the <code>web_accessible_resources</code> key.</p></div></section><section aria-labelledby="manifest_v2_syntax"><h3 id="manifest_v2_syntax"><a href="#manifest_v2_syntax">Manifest V2 syntax</a></h3><div class="section-content"><p>In Manifest V2, web accessible resources are added as an array under the key, like this:</p> <div class="code-example"><div class="example-header"><span class="language-name">json</span></div><pre class="brush: json notranslate"><code>"web_accessible_resources": [ "images/my-image.png" ] </code></pre></div></div></section><section aria-labelledby="manifest_v3_syntax"><h3 id="manifest_v3_syntax"><a href="#manifest_v3_syntax">Manifest V3 syntax</a></h3><div class="section-content"><p>In Manifest V3, the <code>web_accessible_resources</code> key is an array of objects like this:</p> <div class="code-example"><div class="example-header"><span class="language-name">json</span></div><pre class="brush: json notranslate"><code>{ // … "web_accessible_resources": [ { "resources": ["test1.png", "test2.png"], "matches": ["https://web-accessible-resources-1.glitch.me/*"] }, { "resources": ["test3.png", "test4.png"], "matches": ["https://web-accessible-resources-2.glitch.me/*"], "use_dynamic_url": true } ] // … } </code></pre></div> <p>Each object must include a <code>"resources"</code> property and either a <code>"matches"</code> or <code>"extension_ids"</code> property from the following properties:</p> <figure class="table-container"><table class="fullwidth-table standard-table"> <thead> <tr> <th scope="col">Name</th> <th scope="col">Type</th> <th scope="col">Description</th> </tr> </thead> <tbody> <tr> <td> <code>extension_ids</code> </td> <td><code>Array</code> of <code>String</code></td> <td> Optional. Defaults to <code>[]</code>, meaning that other extensions cannot access the resource. <p> A list of extension IDs specifying the extensions that can access the resources. "*" matches all extensions. </p></td> </tr> <tr> <td><code>matches</code></td> <td><code>Array</code> of <code>String</code></td> <td> Optional. Defaults to <code>[]</code>, meaning that other websites cannot access the resource. <p> A list of URL <a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/Match_patterns">match patterns</a> specifying the pages that can access the resources. Only the origin is used to match URLs. However: </p><ul> <li>In Firefox and Safari, any path can be included.</li> <li>In Chrome, the path must be set to <code>/*</code>.</li> </ul> Origins include subdomain matching. </td> </tr> <tr> <td><code>resources</code></td> <td><code>Array</code> of <code>String</code></td> <td> An array of resources to be exposed. Resources are specified as strings and may contain <code>*</code> for wildcard matches. For example, <code>"/images/*"</code> exposes everything in the extension's <code>/images</code> directory recursively, while <code>"*.png"</code> exposes all PNG files. </td> </tr> <tr> <td><code>use_dynamic_url</code></td> <td><code>Boolean</code></td> <td> Optional. Defaults to <code>false</code>. <p> Whether resources to be accessible through the dynamic ID. The dynamic ID is generated per session and regenerated on browser restart or extension reload. </p></td> </tr> </tbody> </table></figure></div></section><section aria-labelledby="using_web_accessible_resources"><h3 id="using_web_accessible_resources"><a href="#using_web_accessible_resources">Using web_accessible_resources</a></h3><div class="section-content"><p>Suppose your extension includes an image file at <code>images/my-image.png</code>, like this:</p> <pre class="brush: plain notranslate">my-extension-files/ manifest.json my-background-script.js images/ my-image.png </pre> <p>To enable a web page to use an <a href="/en-US/docs/Web/HTML/Element/img"><code><img></code></a> element whose <code>src</code> attribute points to this image, you would specify <code>web_accessible_resources</code> like this:</p> <div class="code-example"><div class="example-header"><span class="language-name">json</span></div><pre class="brush: json notranslate"><code>"web_accessible_resources": ["images/my-image.png"] </code></pre></div> <p>The file is then available using a URL like:</p> <pre class="brush: plain notranslate">moz-extension://<extension-UUID>/images/my-image.png" </pre> <p><code><extension-UUID></code> is <strong>not</strong> your extension's ID. This ID is randomly generated for every browser instance. This prevents websites from fingerprinting a browser by examining the extensions it has installed.</p> <div class="notecard note"> <p><strong>Note:</strong> In Chrome in Manifest V2, an extension's ID is fixed. When a resource is listed in <code>web_accessible_resources</code>, it is accessible as <code>chrome-extension://<your-extension-id>/<path/to/resource></code>. In Manifest V3, Chrome can use a dynamic URL by setting <code>use_dynamic_url</code> to <code>true</code>.</p> </div> <p>The recommended approach to obtaining the URL of the resource is to use <a href="/en-US/docs/Mozilla/Add-ons/WebExtensions/API/runtime/getURL"><code>runtime.getURL</code></a> passing the path relative to manifest.json, for example:</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>browser.runtime.getURL("images/my-image.png"); // something like: // moz-extension://944cfddf-7a95-3c47-bd9a-663b3ce8d699/images/my-image.png </code></pre></div> <p>This approach gives you the correct URL regardless of the browser your extension is running on.</p></div></section><section aria-labelledby="wildcards"><h3 id="wildcards"><a href="#wildcards">Wildcards</a></h3><div class="section-content"><p><code>web_accessible_resources</code> entries can contain wildcards. For example, the following entry would also work to include the resource at "images/my-image.png":</p> <div class="code-example"><div class="example-header"><span class="language-name">json</span></div><pre class="brush: json notranslate"><code> "web_accessible_resources": ["images/*.png"] </code></pre></div></div></section><section aria-labelledby="security"><h3 id="security"><a href="#security">Security</a></h3><div class="section-content"><p>If you make a page web-accessible, any website may link or redirect to that page. The page should then treat any input (POST data, for example) as if it came from an untrusted source, just as a normal web page should.</p> <p>Web-accessible extension resources are not blocked by <a href="/en-US/docs/Web/HTTP/CORS">CORS</a> or <a href="/en-US/docs/Web/HTTP/CSP">CSP</a>. Because of this ability to bypass security checks, extensions should avoid using web-accessible scripts when possible. A web-accessible extension script can unexpectedly be misused by malicious websites to weaken the security of other websites. Follow the <a href="https://extensionworkshop.com/documentation/develop/build-a-secure-extension/" class="external" target="_blank">security best practices</a> by avoiding injection of moz-extension:-URLs in web pages and ensuring that third-party libraries are up to date.</p></div></section><section aria-labelledby="example"><h2 id="example"><a href="#example">Example</a></h2><div class="section-content"></div></section><section aria-labelledby="manifest_v2_example"><h3 id="manifest_v2_example"><a href="#manifest_v2_example">Manifest V2 example</a></h3><div class="section-content"><div class="code-example"><div class="example-header"><span class="language-name">json</span></div><pre class="brush: json notranslate"><code>"web_accessible_resources": ["images/my-image.png"] </code></pre></div> <p>Make the file at "images/my-image.png" web accessible to any website and extension.</p></div></section><section aria-labelledby="manifest_v3_example"><h3 id="manifest_v3_example"><a href="#manifest_v3_example">Manifest V3 example</a></h3><div class="section-content"><div class="code-example"><div class="example-header"><span class="language-name">json</span></div><pre class="brush: json notranslate"><code>"web_accessible_resources": [ { "resources": [ "images/my-image.png" ], "extension_ids": ["*"], "matches": [ "*://*/*" ] } ] </code></pre></div> <p>Make the file at "images/my-image.png" web accessible to any website and extension.</p> <p>It is recommended to only specify <code>extension_ids</code> or <code>matches</code> if needed. For example, if the resource only needs to be accessible to web pages at example.com:</p> <div class="code-example"><div class="example-header"><span class="language-name">json</span></div><pre class="brush: json notranslate"><code>"web_accessible_resources": [ { "resources": [ "images/my-image.png" ], "matches": [ "https://example.com/*" ] } ] </code></pre></div></div></section><section aria-labelledby="example_extensions"><h2 id="example_extensions"><a href="#example_extensions">Example extensions</a></h2><div class="section-content"> <ul> <li><a href="https://github.com/mdn/webextensions-examples/tree/main/beastify" class="external" target="_blank">beastify</a></li> <li><a href="https://github.com/mdn/webextensions-examples/tree/main/dnr-redirect-url" class="external" target="_blank">dnr-redirect-url</a></li> </ul></div></section><h2 id="browser_compatibility"><a href="#browser_compatibility">Browser compatibility</a></h2><p>BCD tables only load in the browser<noscript> with JavaScript enabled. 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contributors. Content available under <a href="/en-US/docs/MDN/Writing_guidelines/Attrib_copyright_license">a Creative Commons license</a>.</p></div></div></footer></div><script type="application/json" id="hydration">{"url":"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/web_accessible_resources","doc":{"body":[{"type":"prose","value":{"id":null,"title":null,"isH3":false,"content":"<figure class=\"table-container\"><table class=\"fullwidth-table standard-table\">\n <tbody>\n <tr>\n <th scope=\"row\">Type</th>\n <td><code>Array</code></td>\n </tr>\n <tr>\n <th scope=\"row\">Mandatory</th>\n <td>No</td>\n </tr>\n <tr>\n <th scope=\"row\">Manifest version</th>\n <td>2 or higher</td>\n </tr>\n <tr>\n <th scope=\"row\">Example</th>\n <td>\n <div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">json</span></div><pre class=\"brush: json notranslate\"><code>\"web_accessible_resources\": [\n \"images/my-image.png\"\n]</code></pre></div>\n </td>\n </tr>\n </tbody>\n</table></figure>"}},{"type":"prose","value":{"id":"description","title":"Description","isH3":false,"content":"<p>Sometimes you want to package resources—for example, images, HTML, CSS, or JavaScript—with your extension and make them available to web pages and other extensions.</p>\n<div class=\"notecard note\">\n<p><strong>Note:</strong>\nUntil Firefox 105, extensions could access resources packaged in other extensions by default. From Firefox 105 onwards, to enable other extensions to access an extension's resources they must be included in this key.</p>\n</div>\n<p>For example, the <a href=\"https://github.com/mdn/webextensions-examples/tree/main/beastify\" class=\"external\" target=\"_blank\">Beastify example extension</a> replaces a web page with an image of a beast selected by the user. The beast images are packaged with the extension. To make the selected image visible, the extension adds <a href=\"/en-US/docs/Web/HTML/Element/img\"><code><img></code></a> elements whose <code>src</code> attribute points to the beast's image. For the web page to be able to load the images, they must be made web accessible.</p>\n<p>With the <code>web_accessible_resources</code> key, you list all the packaged resources that you want to make available to web pages. You specify them as paths relative to the manifest.json file.</p>\n<p>Note that content scripts don't need to be listed as web accessible resources.</p>\n<p>If an extension wants to use <a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/webRequest\"><code>webRequest</code></a> or <a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/declarativeNetRequest\"><code>declarativeNetRequest</code></a> to redirect a public URL (e.g., HTTPS) to a page that's packaged in the extension, then the extension must list the page in the <code>web_accessible_resources</code> key.</p>"}},{"type":"prose","value":{"id":"manifest_v2_syntax","title":"Manifest V2 syntax","isH3":true,"content":"<p>In Manifest V2, web accessible resources are added as an array under the key, like this:</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">json</span></div><pre class=\"brush: json notranslate\"><code>\"web_accessible_resources\": [\n \"images/my-image.png\"\n]\n</code></pre></div>"}},{"type":"prose","value":{"id":"manifest_v3_syntax","title":"Manifest V3 syntax","isH3":true,"content":"<p>In Manifest V3, the <code>web_accessible_resources</code> key is an array of objects like this:</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">json</span></div><pre class=\"brush: json notranslate\"><code>{\n // …\n \"web_accessible_resources\": [\n {\n \"resources\": [\"test1.png\", \"test2.png\"],\n \"matches\": [\"https://web-accessible-resources-1.glitch.me/*\"]\n },\n {\n \"resources\": [\"test3.png\", \"test4.png\"],\n \"matches\": [\"https://web-accessible-resources-2.glitch.me/*\"],\n \"use_dynamic_url\": true\n }\n ]\n // …\n}\n</code></pre></div>\n<p>Each object must include a <code>\"resources\"</code> property and either a <code>\"matches\"</code> or <code>\"extension_ids\"</code> property from the following properties:</p>\n<figure class=\"table-container\"><table class=\"fullwidth-table standard-table\">\n <thead>\n <tr>\n <th scope=\"col\">Name</th>\n <th scope=\"col\">Type</th>\n <th scope=\"col\">Description</th>\n </tr>\n </thead>\n <tbody>\n <tr>\n <td>\n <code>extension_ids</code>\n </td>\n <td><code>Array</code> of <code>String</code></td>\n <td>\n Optional. Defaults to <code>[]</code>, meaning that other extensions cannot access the resource.\n <p>\n A list of extension IDs specifying the extensions that can access the resources.\n \"*\" matches all extensions.\n </p></td>\n </tr>\n <tr>\n <td><code>matches</code></td>\n <td><code>Array</code> of <code>String</code></td>\n <td>\n Optional. Defaults to <code>[]</code>, meaning that other websites cannot access the resource.\n <p>\n A list of URL <a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/Match_patterns\">match patterns</a> specifying the pages that can access the resources. Only the origin is used to match URLs. However:\n </p><ul>\n <li>In Firefox and Safari, any path can be included.</li>\n <li>In Chrome, the path must be set to <code>/*</code>.</li>\n </ul>\n Origins include subdomain matching.\n </td>\n </tr>\n <tr>\n <td><code>resources</code></td>\n <td><code>Array</code> of <code>String</code></td>\n <td>\n An array of resources to be exposed. Resources are specified as strings and may contain <code>*</code> for wildcard matches. For example, <code>\"/images/*\"</code> exposes everything in the extension's <code>/images</code> directory recursively, while <code>\"*.png\"</code> exposes all PNG files.\n </td>\n </tr>\n <tr>\n <td><code>use_dynamic_url</code></td>\n <td><code>Boolean</code></td>\n <td>\n Optional. Defaults to <code>false</code>.\n <p>\n Whether resources to be accessible through the dynamic ID. The dynamic ID is generated per session and regenerated on browser restart or extension reload.\n </p></td>\n </tr>\n </tbody>\n</table></figure>"}},{"type":"prose","value":{"id":"using_web_accessible_resources","title":"Using web_accessible_resources","isH3":true,"content":"<p>Suppose your extension includes an image file at <code>images/my-image.png</code>, like this:</p>\n<pre class=\"brush: plain notranslate\">my-extension-files/\n manifest.json\n my-background-script.js\n images/\n my-image.png\n</pre>\n<p>To enable a web page to use an <a href=\"/en-US/docs/Web/HTML/Element/img\"><code><img></code></a> element whose <code>src</code> attribute points to this image, you would specify <code>web_accessible_resources</code> like this:</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">json</span></div><pre class=\"brush: json notranslate\"><code>\"web_accessible_resources\": [\"images/my-image.png\"]\n</code></pre></div>\n<p>The file is then available using a URL like:</p>\n<pre class=\"brush: plain notranslate\">moz-extension://<extension-UUID>/images/my-image.png\"\n</pre>\n<p><code><extension-UUID></code> is <strong>not</strong> your extension's ID. This ID is randomly generated for every browser instance. This prevents websites from fingerprinting a browser by examining the extensions it has installed.</p>\n<div class=\"notecard note\">\n<p><strong>Note:</strong>\nIn Chrome in Manifest V2, an extension's ID is fixed. When a resource is listed in <code>web_accessible_resources</code>, it is accessible as <code>chrome-extension://<your-extension-id>/<path/to/resource></code>. In Manifest V3, Chrome can use a dynamic URL by setting <code>use_dynamic_url</code> to <code>true</code>.</p>\n</div>\n<p>The recommended approach to obtaining the URL of the resource is to use <a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/runtime/getURL\"><code>runtime.getURL</code></a> passing the path relative to manifest.json, for example:</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>browser.runtime.getURL(\"images/my-image.png\");\n// something like:\n// moz-extension://944cfddf-7a95-3c47-bd9a-663b3ce8d699/images/my-image.png\n</code></pre></div>\n<p>This approach gives you the correct URL regardless of the browser your extension is running on.</p>"}},{"type":"prose","value":{"id":"wildcards","title":"Wildcards","isH3":true,"content":"<p><code>web_accessible_resources</code> entries can contain wildcards. For example, the following entry would also work to include the resource at \"images/my-image.png\":</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">json</span></div><pre class=\"brush: json notranslate\"><code> \"web_accessible_resources\": [\"images/*.png\"]\n</code></pre></div>"}},{"type":"prose","value":{"id":"security","title":"Security","isH3":true,"content":"<p>If you make a page web-accessible, any website may link or redirect to that page. The page should then treat any input (POST data, for example) as if it came from an untrusted source, just as a normal web page should.</p>\n<p>Web-accessible extension resources are not blocked by <a href=\"/en-US/docs/Web/HTTP/CORS\">CORS</a> or <a href=\"/en-US/docs/Web/HTTP/CSP\">CSP</a>. Because of this ability to bypass security checks, extensions should avoid using web-accessible scripts when possible. A web-accessible extension script can unexpectedly be misused by malicious websites to weaken the security of other websites. Follow the <a href=\"https://extensionworkshop.com/documentation/develop/build-a-secure-extension/\" class=\"external\" target=\"_blank\">security best practices</a> by avoiding injection of moz-extension:-URLs in web pages and ensuring that third-party libraries are up to date.</p>"}},{"type":"prose","value":{"id":"example","title":"Example","isH3":false,"content":""}},{"type":"prose","value":{"id":"manifest_v2_example","title":"Manifest V2 example","isH3":true,"content":"<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">json</span></div><pre class=\"brush: json notranslate\"><code>\"web_accessible_resources\": [\"images/my-image.png\"]\n</code></pre></div>\n<p>Make the file at \"images/my-image.png\" web accessible to any website and extension.</p>"}},{"type":"prose","value":{"id":"manifest_v3_example","title":"Manifest V3 example","isH3":true,"content":"<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">json</span></div><pre class=\"brush: json notranslate\"><code>\"web_accessible_resources\": [\n {\n \"resources\": [ \"images/my-image.png\" ],\n \"extension_ids\": [\"*\"],\n \"matches\": [ \"*://*/*\" ]\n }\n]\n</code></pre></div>\n<p>Make the file at \"images/my-image.png\" web accessible to any website and extension.</p>\n<p>It is recommended to only specify <code>extension_ids</code> or <code>matches</code> if needed.\nFor example, if the resource only needs to be accessible to web pages at example.com:</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">json</span></div><pre class=\"brush: json notranslate\"><code>\"web_accessible_resources\": [\n {\n \"resources\": [ \"images/my-image.png\" ],\n \"matches\": [ \"https://example.com/*\" ]\n }\n]\n</code></pre></div>"}},{"type":"prose","value":{"id":"example_extensions","title":"Example extensions","isH3":false,"content":"\u003c!-- Ideally we'd use the WebExtExamples template, but examples are not categorized by manifest keys yet - https://github.com/mdn/webextensions-examples/issues/524 -->\n<ul>\n<li><a href=\"https://github.com/mdn/webextensions-examples/tree/main/beastify\" class=\"external\" target=\"_blank\">beastify</a></li>\n<li><a href=\"https://github.com/mdn/webextensions-examples/tree/main/dnr-redirect-url\" class=\"external\" target=\"_blank\">dnr-redirect-url</a></li>\n</ul>"}},{"type":"browser_compatibility","value":{"id":"browser_compatibility","title":"Browser compatibility","isH3":false,"query":"webextensions.manifest.web_accessible_resources"}}],"isActive":true,"isMarkdown":true,"isTranslated":false,"locale":"en-US","mdn_url":"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/web_accessible_resources","modified":"2025-02-18T01:18:54.000Z","native":"English (US)","noIndexing":false,"other_translations":[{"locale":"de","title":"web_accessible_resources","native":"Deutsch"},{"locale":"fr","title":"web_accessible_resources","native":"Français"},{"locale":"ja","title":"web_accessible_resources","native":"日本語"},{"locale":"pt-BR","title":"web_accessible_resources","native":"Português (do Brasil)"},{"locale":"zh-CN","title":"web_accessible_resources","native":"中文 (简体)"}],"pageTitle":"web_accessible_resources - Mozilla | MDN","parents":[{"uri":"/en-US/docs/Mozilla","title":"Mozilla"},{"uri":"/en-US/docs/Mozilla/Add-ons","title":"Add-ons"},{"uri":"/en-US/docs/Mozilla/Add-ons/WebExtensions","title":"Browser extensions"},{"uri":"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json","title":"manifest.json"},{"uri":"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/web_accessible_resources","title":"web_accessible_resources"}],"popularity":null,"short_title":"web_accessible_resources","sidebarHTML":"<ol><li class=\"section\"><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions\">Browser extensions</a></li><li class=\"toggle\"><details><summary>Getting started</summary><ol><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/What_are_WebExtensions\">What are extensions?</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/Your_first_WebExtension\">Your first extension</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/Your_second_WebExtension\">Your second extension</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/Anatomy_of_a_WebExtension\">Anatomy of an extension</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/Examples\">Example extensions</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/What_next\">What next?</a></li></ol></details></li><li class=\"toggle\"><details><summary>Concepts</summary><ol><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API\">JavaScript APIs</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/Content_scripts\">Content scripts</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/Background_scripts\">Background scripts</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/Match_patterns\">Match patterns</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/Working_with_files\">Work with files</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/Internationalization\">Internationalization</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/Content_Security_Policy\">Content Security Policy</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/Native_messaging\">Native messaging</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/Differences_between_API_implementations\">Differences between API implementations</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/Chrome_incompatibilities\">Chrome incompatibilities</a></li></ol></details></li><li class=\"toggle\"><details><summary>User interface</summary><ol><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface\">User interface</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface/Toolbar_button\">Toolbar button</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface/Page_actions\">Address bar button</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface/Sidebars\">Sidebars</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface/Context_menu_items\">Context menu items</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface/Options_pages\">Options page</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface/Extension_pages\">Extension pages</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface/Notifications\">Notifications</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface/Omnibox\">Address bar suggestions</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface/devtools_panels\">devtools panels</a></li></ol></details></li><li class=\"toggle\"><details><summary>How to</summary><ol><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/Intercept_HTTP_requests\">Intercept HTTP requests</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/Modify_a_web_page\">Modify a web page</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/Safely_inserting_external_content_into_a_page\">Insert external content</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/Sharing_objects_with_page_scripts\">Share objects with page scripts</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/Add_a_button_to_the_toolbar\">Add a button to the toolbar</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/Implement_a_settings_page\">Implement a settings page</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/Working_with_the_Tabs_API\">Work with the Tabs API</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/Work_with_the_Bookmarks_API\">Work with the Bookmarks API</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/Work_with_the_Cookies_API\">Work with the Cookies API</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/Work_with_contextual_identities\">Work with contextual identities</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/Interact_with_the_clipboard\">Interact with the clipboard</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/Extending_the_developer_tools\">Extend the developer tools</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/Build_a_cross_browser_extension\">Build a cross-browser extension</a></li></ol></details></li><li class=\"toggle\"><details><summary>JavaScript APIs</summary><ol><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/Browser_support_for_JavaScript_APIs\">Browser support for JavaScript APIs</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/action\">action</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/alarms\">alarms</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/bookmarks\">bookmarks</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/browserAction\">browserAction</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/browserSettings\">browserSettings</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/browsingData\">browsingData</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/captivePortal\">captivePortal</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/clipboard\">clipboard</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/commands\">commands</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/contentScripts\">contentScripts</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/contextualIdentities\">contextualIdentities</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/cookies\">cookies</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/declarativeNetRequest\">declarativeNetRequest</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/devtools\">devtools</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/dns\">dns</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/dom\">dom</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/downloads\">downloads</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/events\">events</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/extension\">extension</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/extensionTypes\">extensionTypes</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/find\">find</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/history\">history</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/i18n\">i18n</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/identity\">identity</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/idle\">idle</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/management\">management</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/menus\">menus</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/notifications\">notifications</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/omnibox\">omnibox</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/pageAction\">pageAction</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/permissions\">permissions</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/pkcs11\">pkcs11</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/privacy\">privacy</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/proxy\">proxy</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/runtime\">runtime</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/scripting\">scripting</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/search\">search</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/sessions\">sessions</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/sidebarAction\">sidebarAction</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/storage\">storage</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/tabs\">tabs</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/theme\">theme</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/topSites\">topSites</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/types\">types</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/userScripts\">userScripts</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/userScripts_legacy\">userScripts (Legacy)</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/webNavigation\">webNavigation</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/webRequest\">webRequest</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/API/windows\">windows</a></li></ol></details></li><li class=\"toggle\"><details open=\"\"><summary>Manifest keys</summary><ol><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/action\">action</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/author\">author</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/background\">background</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/browser_action\">browser_action</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/browser_specific_settings\">browser_specific_settings</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/chrome_settings_overrides\">chrome_settings_overrides</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/chrome_url_overrides\">chrome_url_overrides</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/commands\">commands</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/content_scripts\">content_scripts</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/content_security_policy\">content_security_policy</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/declarative_net_request\">declarative_net_request</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/default_locale\">default_locale</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/description\">description</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/developer\">developer</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/devtools_page\">devtools_page</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/dictionaries\">dictionaries</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/externally_connectable\">externally_connectable</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/homepage_url\">homepage_url</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/host_permissions\">host_permissions</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/icons\">icons</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/incognito\">incognito</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/manifest_version\">manifest_version</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/name\">name</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/offline_enabled\">offline_enabled</a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/omnibox\">omnibox</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/optional_host_permissions\">optional_host_permissions</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/optional_permissions\">optional_permissions</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/options_page\">options_page</a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/options_ui\">options_ui</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/page_action\">page_action</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/permissions\">permissions</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/protocol_handlers\">protocol_handlers</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/short_name\">short_name</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/sidebar_action\">sidebar_action</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/storage\">storage</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/theme\">theme</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/theme_experiment\">theme_experiment</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/user_scripts\">user_scripts</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/version\">version</a></li><li><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/version_name\">version_name</a></li><li><em><a href=\"/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/web_accessible_resources\" aria-current=\"page\">web_accessible_resources</a></em></li></ol></details></li><li class=\"toggle\"><details><summary>Extension Workshop</summary><ol><li><a href=\"https://extensionworkshop.com/documentation/develop/\" class=\"external\" target=\"_blank\">Develop</a></li><li><a href=\"https://extensionworkshop.com/documentation/publish/\" class=\"external\" target=\"_blank\">Publish</a></li><li><a href=\"https://extensionworkshop.com/documentation/manage/\" class=\"external\" target=\"_blank\">Manage</a></li><li><a href=\"https://extensionworkshop.com/documentation/enterprise/\" class=\"external\" target=\"_blank\">Enterprise</a></li></ol></details></li><li class=\"section\"><a href=\"/en-US/docs/Mozilla/Add-ons/Contact_us\">Contact us</a></li><li class=\"toggle\"><details><summary>Channels</summary><ol><li><a href=\"https://blog.mozilla.org/addons\" class=\"external\" target=\"_blank\">Add-ons blog</a></li><li><a href=\"https://discourse.mozilla.org/c/add-ons\" class=\"external\" target=\"_blank\">Add-ons forum</a></li><li><a href=\"https://chat.mozilla.org/#/room/%23addons:mozilla.org\" class=\"external\" target=\"_blank\">Add-ons chat</a></li></ol></details></li></ol>","source":{"folder":"en-us/mozilla/add-ons/webextensions/manifest.json/web_accessible_resources","github_url":"https://github.com/mdn/content/blob/main/files/en-us/mozilla/add-ons/webextensions/manifest.json/web_accessible_resources/index.md","last_commit_url":"https://github.com/mdn/content/commit/213721977b6853cbf73fca4c33ab73ba1144acd0","filename":"index.md"},"summary":"Sometimes you want to package resources—for example, images, HTML, CSS, or JavaScript—with your extension and make them available to web pages and other extensions.","title":"web_accessible_resources","toc":[{"text":"Description","id":"description"},{"text":"Example","id":"example"},{"text":"Example extensions","id":"example_extensions"},{"text":"Browser compatibility","id":"browser_compatibility"}],"browserCompat":["webextensions.manifest.web_accessible_resources"],"pageType":"webextension-manifest-key"}}</script></body></html>