Firefox Developer Edition

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products"> <img loading="lazy" src="https://www.mozilla.org/media/protocol/img/logos/pocket/logo.17446bc33a5d.svg" class="c-menu-item-icon" width="32" height="32" alt=""> <h4 class="c-menu-item-title">Pocket</h4> <p class="c-menu-item-desc">Save and discover the best stories from across the web.</p> </a> </section> </li> <li> <section class="c-menu-item mzp-has-icon"> <a class="c-menu-item-link" href="/en-US/products/vpn/" data-link-text="Mozilla VPN" data-link-position="topnav - products"> <img loading="lazy" src="https://www.mozilla.org/media/protocol/img/logos/mozilla/vpn/logo.c648f487bfb8.svg" class="c-menu-item-icon" width="32" height="32" alt=""> <h4 class="c-menu-item-title">Mozilla VPN</h4> <p class="c-menu-item-desc">Get protection beyond your browser, on all your devices.</p> </a> </section> </li> <li> <section class="c-menu-item mzp-has-icon"> <a class="c-menu-item-link" href="https://relay.firefox.com/?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=nav&utm_content=products" data-link-text="Firefox Relay" data-link-position="topnav - projects"> <img loading="lazy" src="https://www.mozilla.org/media/protocol/img/logos/firefox/relay/logo.683083c53b93.svg" class="c-menu-item-icon" width="32" height="32" alt=""> <h4 class="c-menu-item-title">Firefox Relay</h4> <p class="c-menu-item-desc">Sign up for new accounts without handing over your email address.</p> </a> </section> </li> <li> <section class="c-menu-item mzp-has-icon"> <a class="c-menu-item-link" href="https://developer.mozilla.org/plus?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=nav&utm_content=products" data-link-text="MDN Plus" data-link-position="topnav - projects"> <img loading="lazy" src="https://www.mozilla.org/media/img/nav/icons/icon-mdn-plus.f54475f980ab.svg" class="c-menu-item-icon" width="32" height="32" alt=""> <h4 class="c-menu-item-title">MDN Plus</h4> <p class="c-menu-item-desc">New features and tools for a customized MDN experience</p> </a> </section> </li> <li> <section class="c-menu-item mzp-has-icon"> <a class="c-menu-item-link" href="https://fakespot.com/?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=nav&utm_content=products" data-link-text="Fakespot" data-link-position="topnav - projects"> <img loading="lazy" src="https://www.mozilla.org/media/img/logos/fakespot/logo-blue.3973b8fe9631.svg" class="c-menu-item-icon" width="32" height="32" alt=""> <h4 class="c-menu-item-title">Fakespot</h4> <p class="c-menu-item-desc">Use AI to detect fake reviews and scams</p> </a> </section> </li> </ul> <p class="c-menu-category-link"><a href="/en-US/products/" data-link-text="View all Products" data-link-position="topnav - products">View all Products</a></p> </div> </div> </div> </li> <li class="c-menu-category mzp-has-drop-down mzp-js-expandable"> <a class="c-menu-title" href="/en-US/about/" aria-haspopup="true" aria-controls="c-menu-panel-about" data-testid="navigation-link-who-we-are">Who We Are</a> <div class="c-menu-panel" id="c-menu-panel-about" data-testid="navigation-menu-who-we-are"> <div class="c-menu-panel-container"> <button class="c-menu-button-close" type="button" aria-controls="c-menu-panel-about">Close Who We Are menu</button> <div class="c-menu-panel-content"> <ul class="mzp-l-rows-four"> <li> <section class="c-menu-item mzp-has-icon"> <a class="c-menu-item-link" href="/en-US/about/manifesto/" data-link-text="Mozilla Manifesto" data-link-position="topnav - who-we-are"> <svg class="c-menu-item-icon" xmlns="http://www.w3.org/2000/svg" width="32" height="32" viewBox="0 0 32 32"><path fill="#42435a" d="M9.5 28.6h13.1c2.6 0 4.6-2.1 4.6-4.6V8.1c0-2.6-2.1-4.6-4.6-4.6H9.5c-2.6 0-4.6 2.1-4.6 4.6V24c-.1 2.5 2 4.6 4.6 4.6zM7.6 8.1c0-1 .8-1.8 1.8-1.8h13.1c1 0 1.8.8 1.8 1.8V24c0 1-.8 1.8-1.8 1.8h-13c-1 0-1.8-.8-1.8-1.8V8.1zm12.6 2.3h-8.4c-.4 0-.7-.3-.7-.7 0-.4.3-.7.7-.7h8.4c.4 0 .7.3.7.7 0 .4-.3.7-.7.7zm-8.4 4.2h8.4c.4 0 .7-.3.7-.7s-.3-.7-.7-.7h-8.4c-.4 0-.7.3-.7.7s.3.7.7.7zm8.4 4.2h-8.4c-.4 0-.7-.3-.7-.7s.3-.7.7-.7h8.4c.4 0 .7.3.7.7s-.3.7-.7.7zM11.8 23h3.6c.4 0 .7-.3.7-.7s-.3-.7-.7-.7h-3.6c-.4 0-.7.3-.7.7s.3.7.7.7z"></path></svg> <h4 class="c-menu-item-title">Mozilla Manifesto</h4> <p class="c-menu-item-desc">Learn about the values and principles that guide our mission.</p> </a> </section> </li> <li> <section class="c-menu-item mzp-has-icon"> <a class="c-menu-item-link" href="https://foundation.mozilla.org/?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=nav&utm_content=who-we-are" data-link-text="Mozilla Foundation" data-link-position="topnav - 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who-we-are">More About Mozilla</a> </p> </div> </div> </div> </li> <li class="c-menu-category mzp-has-drop-down mzp-js-expandable"> <a class="c-menu-title" href="https://future.mozilla.org/?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=nav&utm_content=innovation" aria-haspopup="true" aria-controls="c-menu-panel-innovation" data-testid="navigation-link-innovation">Innovation</a> <div class="c-menu-panel" id="c-menu-panel-innovation" data-testid="navigation-menu-innovation"> <div class="c-menu-panel-container"> <button class="c-menu-button-close" type="button" aria-controls="c-menu-panel-innovation">Close Innovation menu</button> <div class="c-menu-panel-content"> <ul class="mzp-l-rows-two"> <li> <section class="c-menu-item mzp-has-icon"> <a class="c-menu-item-link" href="/en-US/firefox/developer/" data-link-text="Firefox Developer Edition" data-link-position="topnav - innovation"> <img loading="lazy" src="https://www.mozilla.org/media/protocol/img/logos/firefox/browser/developer/logo.41d42822c8fb.svg" class="c-menu-item-icon" width="32" height="32" alt=""> <h4 class="c-menu-item-title">Firefox Developer Edition</h4> <p class="c-menu-item-desc">Get the Firefox browser built just for developers.</p> </a> </section> </li> <li> <section class="c-menu-item mzp-has-icon"> <a class="c-menu-item-link" href="https://developer.mozilla.org/?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=nav&utm_content=innovation" data-link-text="MDN Web Docs" data-link-position="topnav - 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Get the latest features, fast performance, and the development tools you need to build for the open web.</p> <div id="intro-download" class="download-button download-button-alpha download-button-desktop mzp-c-button-download-container"> <div class="nojs-download"> <div class="download download-dumb"> <p role="heading" class="download-heading"> <span>Firefox</span> Developer Edition — English (US) </p> <ul> <li><a href="https://download.mozilla.org/?product=firefox-devedition-stub&os=win64&lang=en-US" class="download-link mzp-c-button mzp-t-product ga-product-download" data-download-version="win64" data-cta-text="Download Firefox for Windows 64-bit" data-cta-type="firefox">Windows 64-bit</a> </li><li><a href="https://download.mozilla.org/?product=firefox-devedition-msi-latest-ssl&os=win64&lang=en-US" class="download-link mzp-c-button mzp-t-product ga-product-download" data-download-version="win64-msi" data-cta-text="Download Firefox for Windows 64-bit MSI" data-cta-type="firefox">Windows 64-bit MSI</a> </li><li><a href="https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=win64-aarch64&lang=en-US" class="download-link mzp-c-button mzp-t-product ga-product-download" data-download-version="win64-aarch64" data-cta-text="Download Firefox for Windows ARM64/AArch64" data-cta-type="firefox">Windows ARM64/AArch64</a> </li><li><a href="https://download.mozilla.org/?product=firefox-devedition-stub&os=win&lang=en-US" class="download-link mzp-c-button mzp-t-product ga-product-download" data-download-version="win" data-cta-text="Download Firefox for Windows 32-bit" data-cta-type="firefox">Windows 32-bit</a> </li><li><a href="https://download.mozilla.org/?product=firefox-devedition-msi-latest-ssl&os=win&lang=en-US" class="download-link mzp-c-button mzp-t-product ga-product-download" data-download-version="win-msi" data-cta-text="Download Firefox for Windows 32-bit MSI" data-cta-type="firefox">Windows 32-bit MSI</a> </li><li><a href="https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=osx&lang=en-US" class="download-link mzp-c-button mzp-t-product ga-product-download" data-download-version="osx" data-cta-text="Download Firefox for macOS" data-cta-type="firefox">macOS</a> </li><li><a href="https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=linux64&lang=en-US" class="download-link mzp-c-button mzp-t-product ga-product-download" data-download-version="linux64" data-cta-text="Download Firefox for Linux 64-bit" data-cta-type="firefox">Linux 64-bit</a> </li><li><a href="https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=linux&lang=en-US" class="download-link mzp-c-button mzp-t-product ga-product-download" data-download-version="linux" data-cta-text="Download Firefox for Linux 32-bit" data-cta-type="firefox">Linux 32-bit</a> </li> </ul> </div> </div> <div class="unrecognized-download" data-nosnippet="true"> <p>Your system may not meet the requirements for Firefox, but you can try one of these versions:</p> <div class="download download-dumb"> <p role="heading" class="download-heading"> <span>Firefox</span> Developer Edition — English (US) </p> <ul> <li><a href="https://download.mozilla.org/?product=firefox-devedition-stub&os=win64&lang=en-US" class="download-link mzp-c-button mzp-t-product ga-product-download" data-download-version="win64" data-cta-text="Download Firefox for Windows 64-bit" data-cta-type="firefox">Windows 64-bit</a> </li><li><a href="https://download.mozilla.org/?product=firefox-devedition-msi-latest-ssl&os=win64&lang=en-US" class="download-link mzp-c-button mzp-t-product ga-product-download" data-download-version="win64-msi" data-cta-text="Download Firefox for Windows 64-bit MSI" data-cta-type="firefox">Windows 64-bit MSI</a> </li><li><a href="https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=win64-aarch64&lang=en-US" class="download-link mzp-c-button mzp-t-product ga-product-download" data-download-version="win64-aarch64" data-cta-text="Download Firefox for Windows ARM64/AArch64" data-cta-type="firefox">Windows ARM64/AArch64</a> </li><li><a href="https://download.mozilla.org/?product=firefox-devedition-stub&os=win&lang=en-US" class="download-link mzp-c-button mzp-t-product ga-product-download" data-download-version="win" data-cta-text="Download Firefox for Windows 32-bit" data-cta-type="firefox">Windows 32-bit</a> </li><li><a href="https://download.mozilla.org/?product=firefox-devedition-msi-latest-ssl&os=win&lang=en-US" class="download-link mzp-c-button mzp-t-product ga-product-download" data-download-version="win-msi" data-cta-text="Download Firefox for Windows 32-bit MSI" data-cta-type="firefox">Windows 32-bit MSI</a> </li><li><a href="https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=osx&lang=en-US" class="download-link mzp-c-button mzp-t-product ga-product-download" data-download-version="osx" data-cta-text="Download Firefox for macOS" data-cta-type="firefox">macOS</a> </li><li><a href="https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=linux64&lang=en-US" class="download-link mzp-c-button mzp-t-product ga-product-download" data-download-version="linux64" data-cta-text="Download Firefox for Linux 64-bit" data-cta-type="firefox">Linux 64-bit</a> </li><li><a href="https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=linux&lang=en-US" class="download-link mzp-c-button mzp-t-product ga-product-download" data-download-version="linux" data-cta-text="Download Firefox for Linux 32-bit" data-cta-type="firefox">Linux 32-bit</a> </li> </ul> </div> </div> <div class="fx-unsupported-message win" data-nosnippet="true"> <p><strong>Firefox Developer Edition is <a href="https://support.mozilla.org/kb/firefox-users-windows-7-8-and-81-moving-extended-support">no longer supported</a> on Windows 8.1 and below.</strong></p> <p>Please download Firefox ESR (Extended Support Release) to use Firefox.</p> <div class="download-platform-list"> <p> <a class="mzp-c-button mzp-t-product download-link os_win64 ga-product-download" href="https://download.mozilla.org/?product=firefox-esr115-latest-ssl&os=win64&lang=en-US" data-download-version="win64" data-cta-text="Download Firefox Extended Support Release 64-bit" data-cta-type="firefox"> Download Firefox ESR 64-bit </a> </p> <p> <a class="mzp-c-button mzp-t-product download-link os_win ga-product-download" href="https://download.mozilla.org/?product=firefox-esr115-latest-ssl&os=win&lang=en-US" data-download-version="win" data-cta-text="Download Firefox Extended Support Release 32-bit" data-cta-type="firefox"> Download Firefox ESR 32-bit </a> </p> <small class="fx-unsupported-message-all-link"> <a href="/en-US/firefox/all/desktop-esr/"> Download a different build </a> </small> </div> </div> <div class="fx-unsupported-message mac" data-nosnippet="true"> <p><strong>Firefox Developer Edition is <a href="https://support.mozilla.org/kb/firefox-users-macos-1012-1013-1014-moving-to-extended-support">no longer supported</a> on macOS 10.14 and below.</strong></p> <p>Please download Firefox ESR (Extended Support Release) to use Firefox.</p> <div class="download-platform-list"> <a class="mzp-c-button mzp-t-product download-link ga-product-download" href="https://download.mozilla.org/?product=firefox-esr115-latest-ssl&os=osx&lang=en-US" data-download-version="osx" data-cta-text="Firefox Extended Support Release MacOS" data-cta-type="firefox"> Download Firefox ESR </a> </div> </div> <ul class="download-list"> <li class="os_win64"> <a class="download-link button mzp-t-xl mzp-c-button mzp-t-product ga-product-download" id="intro-download-win64" href="https://download.mozilla.org/?product=firefox-devedition-stub&os=win64&lang=en-US" data-download-version="win64" data-cta-text="Download Firefox for Windows 64-bit" data-testid="intro-download-win64" data-cta-type="firefox" data-cta-position="primary cta"> <strong class="download-title"> <span>Firefox</span> Developer Edition </strong> </a> </li> <li class="os_win64-msi"> <a class="download-link button mzp-t-xl mzp-c-button mzp-t-product ga-product-download" id="intro-download-win64-msi" href="https://download.mozilla.org/?product=firefox-devedition-msi-latest-ssl&os=win64&lang=en-US" data-download-version="win64-msi" data-cta-text="Download Firefox for Windows 64-bit MSI" data-testid="intro-download-win64-msi" data-cta-type="firefox" data-cta-position="primary cta"> <strong class="download-title"> <span>Firefox</span> Developer Edition </strong> </a> </li> <li class="os_win64-aarch64"> <a class="download-link button mzp-t-xl mzp-c-button mzp-t-product ga-product-download" id="intro-download-win64-aarch64" href="https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=win64-aarch64&lang=en-US" data-download-version="win64-aarch64" data-cta-text="Download Firefox for Windows ARM64/AArch64" data-testid="intro-download-win64-aarch64" data-cta-type="firefox" data-cta-position="primary cta"> <strong class="download-title"> <span>Firefox</span> Developer Edition </strong> </a> </li> <li class="os_win"> <a class="download-link button mzp-t-xl mzp-c-button mzp-t-product ga-product-download" id="intro-download-win" href="https://download.mozilla.org/?product=firefox-devedition-stub&os=win&lang=en-US" data-download-version="win" data-cta-text="Download Firefox for Windows 32-bit" data-testid="intro-download-win" data-cta-type="firefox" data-cta-position="primary cta"> <strong class="download-title"> <span>Firefox</span> Developer Edition </strong> </a> </li> <li class="os_win-msi"> <a class="download-link button mzp-t-xl mzp-c-button mzp-t-product ga-product-download" id="intro-download-win-msi" href="https://download.mozilla.org/?product=firefox-devedition-msi-latest-ssl&os=win&lang=en-US" data-download-version="win-msi" data-cta-text="Download Firefox for Windows 32-bit MSI" data-testid="intro-download-win-msi" data-cta-type="firefox" data-cta-position="primary cta"> <strong class="download-title"> <span>Firefox</span> Developer Edition </strong> </a> </li> <li class="os_osx"> <a class="download-link button mzp-t-xl mzp-c-button mzp-t-product ga-product-download" id="intro-download-osx" href="https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=osx&lang=en-US" data-download-version="osx" data-cta-text="Download Firefox for macOS" data-testid="intro-download-osx" data-cta-type="firefox" data-cta-position="primary cta"> <strong class="download-title"> <span>Firefox</span> Developer Edition </strong> </a> </li> <li class="os_linux64"> <a class="download-link button mzp-t-xl mzp-c-button mzp-t-product ga-product-download" id="intro-download-linux64" href="https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=linux64&lang=en-US" data-download-version="linux64" data-cta-text="Download Firefox for Linux 64-bit" data-testid="intro-download-linux64" data-cta-type="firefox" data-cta-position="primary cta"> <strong class="download-title"> Download for Linux 64-bit </strong> </a> </li> <li class="os_linux"> <a class="download-link button mzp-t-xl mzp-c-button mzp-t-product ga-product-download" id="intro-download-linux" href="https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=linux&lang=en-US" data-download-version="linux" data-cta-text="Download Firefox for Linux 32-bit" data-testid="intro-download-linux" data-cta-type="firefox" data-cta-position="primary cta"> <strong class="download-title"> Download for Linux 32-bit </strong> </a> </li> </ul> <small class="fx-privacy-link mzp-c-button-download-privacy-link"> <a href="/en-US/privacy/firefox/"> Firefox Privacy Notice </a> </small> </div> <p class="show-linux">Using Debian, Ubuntu or any Debian-based distribution?<br> You can set up our <a href="https://support.mozilla.org/products/firefox/install-and-update-firefox#w_install-firefox-deb-package-for-debian-based-distributions" rel="external noopener" data-cta-text="Get help with your installation">APT repository instead</a>.</p> <p class="intro-feedback-note"> Firefox Developer Edition automatically sends feedback to Mozilla. <a href="/en-US/privacy/firefox/#pre-release" class="more">Learn more</a> </p> </div> <section id="fordevs" class="mzp-c-split mzp-t-split-nospace"> <div class="mzp-c-split-container"> <div class="mzp-c-split-media"> <img src="https://www.mozilla.org/media/img/firefox/developer/stylo-engine.44d72db41ee9.svg" alt="" class="mzp-c-split-media-asset"> </div> <div class="mzp-c-split-body"> <h2 class="mzp-u-title-xs">Firefox Developer Edition</h2> <h3 class="mzp-u-title-sm">The browser made for developers</h3> <p>All the latest developer tools in beta in addition to features like the Multi-line Console Editor and WebSocket Inspector.</p> <p>A <strong>separate profile and path</strong> so you can easily run it alongside Release or Beta Firefox.</p> <p>Preferences <strong>tailored for web developers</strong>: Browser and remote debugging are enabled by default, as are the dark theme and developer toolbar button.</p> </div> </div> </section> <section class="t-highlights mzp-l-content mzp-l-card-half mzp-t-content-xl"> <section class="mzp-c-card mzp-c-card-medium mzp-has-aspect-16-9 " id="inactive"> <a class="mzp-c-card-block-link" href="https://hacks.mozilla.org/2019/10/firefox-70-a-bountiful-release-for-all/#developertools" data-link-text="Pioneers of The Open Web" data-link-position="card" data-card-tag="New Tools" rel="external" > <div class="mzp-c-card-media-wrapper"><img loading="lazy" src="https://www.mozilla.org/media/img/firefox/developer/hero-inactive-css.40a2e0b8ddb1.png" srcset="https://www.mozilla.org/media/img/firefox/developer/hero-inactive-css-high-res.87cdf3a5bf40.png 2x" alt="Inactive CSS" class="mzp-c-card-image" height="280" width="560"></div> <div class="mzp-c-card-content"> <div class="mzp-c-card-tag">New Tools</div> <h2 class="mzp-c-card-title"><span>Inactive CSS</span></h2> <p class="mzp-c-card-desc">Firefox DevTools now grays out CSS declarations that don’t have an effect on the page. When you hover over the info icon, you’ll see a useful message about why the CSS is not being applied, including a hint about how to fix the problem.</p> <p class="mzp-c-card-cta"><span class="mzp-c-card-cta-text">Learn more</span></p> </div> </a> </section> <section class="mzp-c-card mzp-c-card-medium mzp-has-aspect-16-9 " id="devtools"> <a class="mzp-c-card-block-link" href="https://mozilladevelopers.github.io/playground/debugger/" data-link-text="Pioneers of The Open Web" data-link-position="card" data-card-tag="New Tools" rel="external" > <div class="mzp-c-card-media-wrapper"><img loading="lazy" src="https://www.mozilla.org/media/img/firefox/developer/hero-debugger-ani.7e04d95e76ea.gif" alt="Firefox DevTools" class="mzp-c-card-image" height="280" width="560"></div> <div class="mzp-c-card-content"> <div class="mzp-c-card-tag">New Tools</div> <h2 class="mzp-c-card-title"><span>Firefox DevTools</span></h2> <p class="mzp-c-card-desc">The new Firefox DevTools are powerful, flexible, and best of all, hackable. This includes a best-in-class JavaScript debugger, which can target multiple browsers and is built in React and Redux.</p> <p class="mzp-c-card-cta"><span class="mzp-c-card-cta-text">Learn more</span></p> </div> </a> </section> <section class="mzp-c-card mzp-c-card-medium mzp-has-aspect-16-9 " id="cssgrid"> <a class="mzp-c-card-block-link" href="https://mozilladevelopers.github.io/playground/css-grid/" data-link-text="Pioneers of The Open Web" data-link-position="card" data-card-tag="Innovative Features" rel="external" > <div class="mzp-c-card-media-wrapper"><img loading="lazy" src="https://www.mozilla.org/media/img/firefox/developer/hero-cssgrid-ani.c0a7ace9dbf7.gif" alt="Master CSS Grid" class="mzp-c-card-image" height="280" width="560"></div> <div class="mzp-c-card-content"> <div class="mzp-c-card-tag">Innovative Features</div> <h2 class="mzp-c-card-title"><span>Master CSS Grid</span></h2> <p class="mzp-c-card-desc">Firefox is the only browser with tools built specifically for building and designing with CSS Grid. These tools allow you to visualize the grid, display associated area names, preview transformations on the grid and much more.</p> <p class="mzp-c-card-cta"><span class="mzp-c-card-cta-text">Learn more</span></p> </div> </a> </section> <section class="mzp-c-card mzp-c-card-medium mzp-has-aspect-16-9 " id="fonts"> <a class="mzp-c-card-block-link" href="https://firefox-source-docs.mozilla.org/devtools-user/page_inspector/how_to/edit_fonts/" data-link-text="Pioneers of The Open Web" data-link-position="card" data-card-tag="Faster Information" rel="external" > <div class="mzp-c-card-media-wrapper"><img loading="lazy" src="https://www.mozilla.org/media/img/firefox/developer/hero-fonts.0e574b98aa63.gif" alt="Fonts Panel" class="mzp-c-card-image" height="280" width="560"></div> <div class="mzp-c-card-content"> <div class="mzp-c-card-tag">Faster Information</div> <h2 class="mzp-c-card-title"><span>Fonts Panel</span></h2> <p class="mzp-c-card-desc">The new fonts panel in Firefox DevTools gives developers quick access to all of the information they need about the fonts being used in an element. It also includes valuable information such as the font source, weight, style and more.</p> <p class="mzp-c-card-cta"><span class="mzp-c-card-cta-text">Learn more</span></p> </div> </a> </section> </section> <section class="t-features"> <div class="mzp-c-section-heading"> <h2 class="mzp-u-title-3xs"><span>Design. Code. Test. Refine.</span></h2> <h3 class="mzp-u-title-sm">Build and Perfect your sites<br> with Firefox DevTools</h3> </div> <div class="mzp-l-content mzp-l-columns mzp-t-columns-three mzp-t-content-xl"> <div class="mzp-c-picto"> <img loading="lazy" src="https://www.mozilla.org/media/img/firefox/developer/feature-inspector.846d4472fc48.svg" alt="" class="mzp-c-picto-image" width="202" height="124"> <h3 class="mzp-c-picto-heading">Inspector</h3> <div class="mzp-c-picto-body"> <p>Inspect and refine code to build pixel-perfect layouts.</p> <p> <a href="https://firefox-source-docs.mozilla.org/devtools-user/page_inspector/" class="mzp-c-cta-link" rel="external"> Learn more about Page Inspector </a> </p> </div> </div> <div class="mzp-c-picto"> <img loading="lazy" src="https://www.mozilla.org/media/img/firefox/developer/feature-console.bb8ff8c59fb7.svg" alt="" class="mzp-c-picto-image" width="182" height="124"> <h3 class="mzp-c-picto-heading">Console</h3> <div class="mzp-c-picto-body"> <p>Track CSS, JavaScript, security and network issues.</p> <p> <a href="https://firefox-source-docs.mozilla.org/devtools-user/web_console/" class="mzp-c-cta-link" rel="external"> Learn more about Web Console </a> </p> </div> </div> <div class="mzp-c-picto"> <img loading="lazy" src="https://www.mozilla.org/media/img/firefox/developer/feature-debugger.e2ff80ae359d.svg" alt="" class="mzp-c-picto-image" width="202" height="110"> <h3 class="mzp-c-picto-heading">Debugger</h3> <div class="mzp-c-picto-body"> <p>Powerful JavaScript debugger with support for your framework.</p> <p> <a href="https://firefox-source-docs.mozilla.org/devtools-user/debugger/" class="mzp-c-cta-link" rel="external"> Learn more about JavaScript Debugger </a> </p> </div> </div> <div class="mzp-c-picto"> <img loading="lazy" src="https://www.mozilla.org/media/img/firefox/developer/feature-network.0f066e5fa9cc.svg" alt="" class="mzp-c-picto-image" width="232" height="124"> <h3 class="mzp-c-picto-heading">Network</h3> <div class="mzp-c-picto-body"> <p>Monitor network requests that can slow or block your site.</p> <p> <a href="https://firefox-source-docs.mozilla.org/devtools-user/network_monitor/" class="mzp-c-cta-link" rel="external"> Learn more about Network Monitor </a> </p> </div> </div> <div class="mzp-c-picto"> <img loading="lazy" src="https://www.mozilla.org/media/img/firefox/developer/feature-storage.c05881595de9.svg" alt="" class="mzp-c-picto-image" width="134" height="124"> <h3 class="mzp-c-picto-heading">Storage panel</h3> <div class="mzp-c-picto-body"> <p>Add, modify and remove cache, cookies, databases and session data.</p> <p> <a href="https://firefox-source-docs.mozilla.org/devtools-user/storage_inspector/" class="mzp-c-cta-link" rel="external"> Learn more about Storage Panel </a> </p> </div> </div> <div class="mzp-c-picto"> <img loading="lazy" src="https://www.mozilla.org/media/img/firefox/developer/feature-responsive-mode.7b90657adbdb.svg" alt="" class="mzp-c-picto-image" width="194" height="124"> <h3 class="mzp-c-picto-heading">Responsive Design Mode</h3> <div class="mzp-c-picto-body"> <p>Test sites on emulated devices in your browser.</p> <p> <a href="https://firefox-source-docs.mozilla.org/devtools-user/responsive_design_mode/" class="mzp-c-cta-link" rel="external"> Learn more about Responsive Design View </a> </p> </div> </div> <div class="mzp-c-picto"> <img loading="lazy" src="https://www.mozilla.org/media/img/firefox/developer/feature-visual-editing.5d222d53b196.svg" alt="" class="mzp-c-picto-image" width="112" height="124"> <h3 class="mzp-c-picto-heading">Visual Editing</h3> <div class="mzp-c-picto-body"> <p>Fine-tune animations, alignment and padding.</p> <p> <a href="https://hacks.mozilla.org/2015/11/developer-edition-44-creative-tools-and-more" class="mzp-c-cta-link" rel="external"> Learn more about Visual Editing </a> </p> </div> </div> <div class="mzp-c-picto"> <img loading="lazy" src="https://www.mozilla.org/media/img/firefox/developer/feature-performance.98d6fd75f6d5.svg" alt="" class="mzp-c-picto-image" width="202" height="124"> <h3 class="mzp-c-picto-heading">Performance</h3> <div class="mzp-c-picto-body"> <p>Unblock bottlenecks, streamline processes, optimize assets.</p> <p> <a href="https://firefox-source-docs.mozilla.org/devtools-user/performance/" class="mzp-c-cta-link" rel="external"> Learn more about Performance Tools </a> </p> </div> </div> <div class="mzp-c-picto"> <img loading="lazy" src="https://www.mozilla.org/media/img/firefox/developer/feature-memory.63c9ef1c51c7.svg" alt="" class="mzp-c-picto-image" width="116" height="124"> <h3 class="mzp-c-picto-heading">Memory</h3> <div class="mzp-c-picto-body"> <p>Find memory leaks and make your application zippy.</p> <p> <a href="https://firefox-source-docs.mozilla.org/devtools-user/memory/" class="mzp-c-cta-link" rel="external"> Learn more about Memory Tools </a> </p> </div> </div> <div class="mzp-c-picto"> <img loading="lazy" src="https://www.mozilla.org/media/img/firefox/developer/feature-style-editor.29b8f89c644e.svg" alt="" class="mzp-c-picto-image" width="116" height="124"> <h3 class="mzp-c-picto-heading">Style Editor</h3> <div class="mzp-c-picto-body"> <p>Edit and manage all your CSS stylesheets in your browser.</p> <p> <a href="https://firefox-source-docs.mozilla.org/devtools-user/style_editor/" class="mzp-c-cta-link" rel="external"> Learn more about Style Editor </a> </p> </div> </div> </div> </section> <aside> <section id="newsletter" class="mzp-c-split mzp-l-split-reversed"> <div class="mzp-c-split-container"> <div class="mzp-c-split-media mzp-l-split-h-center"> <img loading="lazy" src="https://www.mozilla.org/media/img/firefox/developer/mail.0f885d7b3a03.svg" alt="" width="200"> </div> <div class="mzp-c-split-body"> <form id="newsletter-form" class="mzp-c-newsletter-form" action="https://basket.mozilla.org/news/subscribe/" method="post" 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value="vg">Virgin Islands, British</option> <option value="vi">Virgin Islands, U.S.</option> <option value="qw">Wake Island</option> <option value="wf">Wallis and Futuna</option> <option value="xw">West Bank</option> <option value="eh">Western Sahara</option> <option value="ye">Yemen</option> <option value="zm">Zambia</option> <option value="zw">Zimbabwe</option> </select></p> <input type="hidden" name="lang" id="id_lang" value="en"> <p> <label for="privacy" class="mzp-u-inline"> <input type="checkbox" id="privacy" name="privacy" required aria-required="true" data-testid="newsletter-privacy-checkbox"> I’m okay with Mozilla handling my info as explained in <a href="/en-US/privacy/websites/">this Privacy Notice</a> </label> </p> </div> </div> <p class="mzp-c-form-submit"> <button type="submit" id="newsletter-submit" class="mzp-c-button mzp-t-product mzp-t-lg" data-cta-text="Newsletter Sign Up" data-testid="newsletter-submit-button"> Sign Up Now </button> <span class="mzp-c-fieldnote"> We 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You can unsubscribe at any time. </span> </p> </fieldset> </form> <div id="newsletter-thanks" class="mzp-c-newsletter-thanks hidden" data-testid="newsletter-thanks-message"> <h3>Thanks!</h3> <p>If you haven’t previously confirmed a subscription to a Mozilla-related newsletter, you may have to do so. Please check your inbox or your spam filter for an email from us.</p> </div> </div> </div> </section> </aside> <section class="mzp-t-dark t-engage"> <div class="mzp-l-content mzp-l-columns mzp-t-columns-two mzp-t-picto-side"> <div class="mzp-c-picto"> <img loading="lazy" src="https://www.mozilla.org/media/img/firefox/developer/icon-speak.7724cf991f8f.svg" alt="" class="mzp-c-picto-image" width="64"> <h3 class="mzp-c-picto-heading">Speak up</h3> <div class="mzp-c-picto-body"> <p>Feedback makes us better. Tell us how we can improve the browser and Developer tools.</p> <p><a class="mzp-c-cta-link" href="https://discourse.mozilla.org/c/devtools">Join the conversation</a></p> </div> </div> <div class="mzp-c-picto"> <img loading="lazy" src="https://www.mozilla.org/media/img/firefox/developer/icon-involved.e300841086cb.svg" alt="" class="mzp-c-picto-image" width="64"> <h3 class="mzp-c-picto-heading">Get involved</h3> <div class="mzp-c-picto-body"> <p>Help build the last independent browser. Write code, fix bugs, make add-ons, and more.</p> <p><a class="mzp-c-cta-link" href="https://firefox-dev.tools/">Start now</a></p> </div> </div> </div> <section class="mzp-c-split mzp-l-split-reversed mzp-l-split-center-on-sm-md"> <div class="mzp-c-split-container"> <div class="mzp-c-split-body"> <h2>Download the Firefox browser made for developers</h2> <div id="footer-download" class="download-button download-button-alpha download-button-desktop mzp-c-button-download-container"> <div class="nojs-download"> <div class="download download-dumb"> <p role="heading" class="download-heading"> <span>Firefox</span> Developer Edition — English (US) </p> <ul> <li><a href="https://download.mozilla.org/?product=firefox-devedition-stub&os=win64&lang=en-US" class="download-link mzp-c-button mzp-t-product ga-product-download" data-download-version="win64" data-cta-text="Download Firefox for Windows 64-bit" data-cta-type="firefox">Windows 64-bit</a> </li><li><a href="https://download.mozilla.org/?product=firefox-devedition-msi-latest-ssl&os=win64&lang=en-US" class="download-link mzp-c-button mzp-t-product ga-product-download" data-download-version="win64-msi" data-cta-text="Download Firefox for Windows 64-bit MSI" data-cta-type="firefox">Windows 64-bit MSI</a> </li><li><a href="https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=win64-aarch64&lang=en-US" class="download-link mzp-c-button mzp-t-product ga-product-download" data-download-version="win64-aarch64" data-cta-text="Download Firefox for Windows ARM64/AArch64" data-cta-type="firefox">Windows ARM64/AArch64</a> </li><li><a href="https://download.mozilla.org/?product=firefox-devedition-stub&os=win&lang=en-US" class="download-link mzp-c-button mzp-t-product ga-product-download" data-download-version="win" data-cta-text="Download Firefox for Windows 32-bit" data-cta-type="firefox">Windows 32-bit</a> </li><li><a href="https://download.mozilla.org/?product=firefox-devedition-msi-latest-ssl&os=win&lang=en-US" class="download-link mzp-c-button mzp-t-product ga-product-download" data-download-version="win-msi" data-cta-text="Download Firefox for Windows 32-bit MSI" data-cta-type="firefox">Windows 32-bit MSI</a> </li><li><a href="https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=osx&lang=en-US" class="download-link mzp-c-button mzp-t-product ga-product-download" data-download-version="osx" data-cta-text="Download Firefox for macOS" data-cta-type="firefox">macOS</a> </li><li><a href="https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=linux64&lang=en-US" class="download-link mzp-c-button mzp-t-product ga-product-download" data-download-version="linux64" data-cta-text="Download Firefox for Linux 64-bit" data-cta-type="firefox">Linux 64-bit</a> </li><li><a href="https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=linux&lang=en-US" class="download-link mzp-c-button mzp-t-product ga-product-download" data-download-version="linux" data-cta-text="Download Firefox for Linux 32-bit" data-cta-type="firefox">Linux 32-bit</a> </li> </ul> </div> </div> <div class="unrecognized-download" data-nosnippet="true"> <p>Your system may not meet the requirements for Firefox, but you can try one of these versions:</p> <div class="download download-dumb"> <p role="heading" class="download-heading"> <span>Firefox</span> Developer Edition — English (US) </p> <ul> <li><a href="https://download.mozilla.org/?product=firefox-devedition-stub&os=win64&lang=en-US" class="download-link mzp-c-button mzp-t-product ga-product-download" data-download-version="win64" data-cta-text="Download Firefox for Windows 64-bit" data-cta-type="firefox">Windows 64-bit</a> </li><li><a href="https://download.mozilla.org/?product=firefox-devedition-msi-latest-ssl&os=win64&lang=en-US" class="download-link mzp-c-button mzp-t-product ga-product-download" data-download-version="win64-msi" data-cta-text="Download Firefox for Windows 64-bit MSI" data-cta-type="firefox">Windows 64-bit MSI</a> </li><li><a href="https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=win64-aarch64&lang=en-US" class="download-link mzp-c-button mzp-t-product ga-product-download" data-download-version="win64-aarch64" data-cta-text="Download Firefox for Windows ARM64/AArch64" data-cta-type="firefox">Windows ARM64/AArch64</a> </li><li><a href="https://download.mozilla.org/?product=firefox-devedition-stub&os=win&lang=en-US" class="download-link mzp-c-button mzp-t-product ga-product-download" data-download-version="win" data-cta-text="Download Firefox for Windows 32-bit" data-cta-type="firefox">Windows 32-bit</a> </li><li><a href="https://download.mozilla.org/?product=firefox-devedition-msi-latest-ssl&os=win&lang=en-US" class="download-link mzp-c-button mzp-t-product ga-product-download" data-download-version="win-msi" data-cta-text="Download Firefox for Windows 32-bit MSI" data-cta-type="firefox">Windows 32-bit MSI</a> </li><li><a href="https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=osx&lang=en-US" class="download-link mzp-c-button mzp-t-product ga-product-download" data-download-version="osx" data-cta-text="Download Firefox for macOS" data-cta-type="firefox">macOS</a> </li><li><a href="https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=linux64&lang=en-US" class="download-link mzp-c-button mzp-t-product ga-product-download" data-download-version="linux64" data-cta-text="Download Firefox for Linux 64-bit" data-cta-type="firefox">Linux 64-bit</a> </li><li><a href="https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=linux&lang=en-US" class="download-link mzp-c-button mzp-t-product ga-product-download" data-download-version="linux" data-cta-text="Download Firefox for Linux 32-bit" data-cta-type="firefox">Linux 32-bit</a> </li> </ul> </div> </div> <div class="fx-unsupported-message win" data-nosnippet="true"> <p><strong>Firefox Developer Edition is <a href="https://support.mozilla.org/kb/firefox-users-windows-7-8-and-81-moving-extended-support">no longer supported</a> on Windows 8.1 and below.</strong></p> <p>Please download Firefox ESR (Extended Support Release) to use Firefox.</p> <div class="download-platform-list"> <p> <a class="mzp-c-button mzp-t-product download-link os_win64 ga-product-download" href="https://download.mozilla.org/?product=firefox-esr115-latest-ssl&os=win64&lang=en-US" data-download-version="win64" data-cta-text="Download Firefox Extended Support Release 64-bit" data-cta-type="firefox"> Download Firefox ESR 64-bit </a> </p> <p> <a class="mzp-c-button mzp-t-product download-link os_win ga-product-download" href="https://download.mozilla.org/?product=firefox-esr115-latest-ssl&os=win&lang=en-US" data-download-version="win" data-cta-text="Download Firefox Extended Support Release 32-bit" data-cta-type="firefox"> Download Firefox ESR 32-bit </a> </p> <small class="fx-unsupported-message-all-link"> <a href="/en-US/firefox/all/desktop-esr/"> Download a different build </a> </small> </div> </div> <div class="fx-unsupported-message mac" data-nosnippet="true"> <p><strong>Firefox Developer Edition is <a href="https://support.mozilla.org/kb/firefox-users-macos-1012-1013-1014-moving-to-extended-support">no longer supported</a> on macOS 10.14 and below.</strong></p> <p>Please download Firefox ESR (Extended Support Release) to use Firefox.</p> <div class="download-platform-list"> <a class="mzp-c-button mzp-t-product download-link ga-product-download" href="https://download.mozilla.org/?product=firefox-esr115-latest-ssl&os=osx&lang=en-US" data-download-version="osx" data-cta-text="Firefox Extended Support Release MacOS" data-cta-type="firefox"> Download Firefox ESR </a> </div> </div> <ul class="download-list"> <li class="os_win64"> <a class="download-link button mzp-t-xl mzp-c-button mzp-t-product 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