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products"> <img loading="lazy" src="https://www.mozilla.org/media/protocol/img/logos/mozilla/vpn/logo.c648f487bfb8.svg" class="m24-c-menu-item-icon" width="32" height="32" alt=""> <h2 class="m24-c-menu-item-title">Mozilla VPN</h2> </a> </section> </li> <li> <section class="m24-c-menu-item mzp-has-icon"> <a class="m24-c-menu-item-link" href="https://monitor.mozilla.org/?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=nav&utm_content=products" data-link-text="Mozilla Monitor" data-link-position="topnav - products"> <img loading="lazy" src="https://www.mozilla.org/media/protocol/img/logos/firefox/monitor/logo.d97e5516f9e6.svg" class="m24-c-menu-item-icon" width="32" height="32" alt=""> <h2 class="m24-c-menu-item-title">Mozilla Monitor</h2> </a> </section> </li> <li> <section class="m24-c-menu-item mzp-has-icon"> <a class="m24-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 - products"> <img loading="lazy" src="https://www.mozilla.org/media/protocol/img/logos/firefox/relay/logo-white.d42a8b52e44c.svg" class="m24-c-menu-item-icon" width="32" height="32" alt=""> <h2 class="m24-c-menu-item-title">Firefox Relay</h2> </a> </section> </li> <li> <section class="m24-c-menu-item mzp-has-icon"> <a class="m24-c-menu-item-link" href="https://getpocket.com/firefox_learnmore/?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=nav&utm_content=products" data-link-text="Pocket" data-link-position="topnav - products"> <img loading="lazy" src="https://www.mozilla.org/media/protocol/img/logos/pocket/logo.17446bc33a5d.svg" class="m24-c-menu-item-icon" width="32" height="32" alt=""> <h2 class="m24-c-menu-item-title">Pocket</h2> </a> </section> </li> <li> <section class="m24-c-menu-item mzp-has-icon"> <a class="m24-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 - products"> <img loading="lazy" src="https://www.mozilla.org/media/img/logos/mdn/mdn-plus-logo.c615b46ca4ce.svg" class="m24-c-menu-item-icon" width="32" height="32" alt=""> <h2 class="m24-c-menu-item-title">MDN Plus</h2> </a> </section> </li> <li> <section class="m24-c-menu-item mzp-has-icon"> <a class="m24-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 - products" aria-labelledby="fakespot-aria-hint"> <img loading="lazy" src="https://www.mozilla.org/media/img/logos/fakespot/logo-blue.3973b8fe9631.svg" class="m24-c-menu-item-icon" width="32" height="32" alt=""> <h2 class="m24-c-menu-item-title" aria-labelledby="fakespot-aria-hint">Fakespot</h2> <span id="fakespot-aria-hint" aria-label="fake spot"></span> </a> </section> </li> <li> <section class="m24-c-menu-item mzp-has-icon"> <a class="m24-c-menu-item-link" href="https://www.thunderbird.net/?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=nav&utm_content=products" data-link-text="Thunderbird" data-link-position="topnav - products"> <img loading="lazy" src="https://www.mozilla.org/media/img/logos/thunderbird/logo-thunderbird.121e9c0fed45.svg" class="m24-c-menu-item-icon" width="32" height="32" alt=""> <h2 class="m24-c-menu-item-title">Thunderbird</h2> </a> </section> </li> </ul> <p class="m24-c-menu-category-link"> <a href="/en-US/products/" data-link-text="Go to all browsers and products" data-link-position="topnav - products"> All products <svg xmlns="http://www.w3.org/2000/svg" xml:space="preserve" width="24" height="24" viewBox="0 0 23.4 24" fill="currentColor"> <path d="M23.4 12 9.1 0v10.5H0v3h9.1V24l14.3-12zm-11.3-1.5v-4l6.6 5.5-6.6 5.5v-7z"/> </svg> </a> </p> </div> </div><!-- close .m24-c-menu-panel-container --> </div><!-- close .m24-c-menu-panel --> </li><!-- close products --> <li class="m24-c-menu-category mzp-has-drop-down mzp-js-expandable"> <a class="m24-c-menu-title" href="/en-US/about/" aria-haspopup="true" aria-controls="m24-c-menu-panel-about" data-testid="m24-navigation-link-about-us">About us</a> <div class="m24-c-menu-panel" id="m24-c-menu-panel-about" data-testid="m24-navigation-menu-about-us"> <div class="m24-c-menu-panel-container"> <button class="m24-c-menu-button-close" type="button" aria-controls="m24-c-menu-panel-about">Close About us menu</button> <div class="m24-c-menu-panel-content multi-column"> <div class="m24-mzp-l-content-container"> <p>Our Mission</p> <ul class="m24-mzp-l-content"> <li> <section class="m24-c-menu-item"> <a class="m24-c-menu-item-link" href="/en-US/about/" data-link-text="About Mozilla" data-link-position="topnav - about"> <h2 class="m24-c-menu-item-title">About Mozilla</h2> </a> </section> </li> <li> <section class="m24-c-menu-item"> <a class="m24-c-menu-item-link" href="/en-US/about/manifesto/" data-link-text="The Mozilla manifesto" data-link-position="topnav - about"> <h2 class="m24-c-menu-item-title">The Mozilla Manifesto</h2> </a> </section> </li> <li> <section class="m24-c-menu-item"> <a class="m24-c-menu-item-link" href="/en-US/contribute/" data-link-text="Get Involved" data-link-position="topnav - about"> <h2 class="m24-c-menu-item-title">Get Involved</h2> </a> </section> </li> <li> <section class="m24-c-menu-item"> <a class="m24-c-menu-item-link" href="https://future.mozilla.org/?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=nav&utm_content=about-us" data-link-text="Innovation Projects" data-link-position="topnav - about"> <h2 class="m24-c-menu-item-title">Innovation Projects</h2> </a> </section> </li> <li> <section class="m24-c-menu-item"> <a class="m24-c-menu-item-link" href="https://blog.mozilla.org/?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=nav&utm_content=about-us" data-link-text="Blog" data-link-position="topnav - about"> <h2 class="m24-c-menu-item-title">Blog</h2> </a> </section> </li> </ul> </div> <div class="m24-mzp-l-content-container"> <p>Our Work</p> <ul class="m24-mzp-l-content"> <li> <section class="m24-c-menu-item"> <a class="m24-c-menu-item-link" href="https://foundation.mozilla.org/?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=nav&utm_content=about-us" data-link-text="Mozilla Foundation" data-link-position="topnav - about"> <h2 class="m24-c-menu-item-title">Mozilla Foundation</h2> </a> </section> </li> <li> <section class="m24-c-menu-item"> <a class="m24-c-menu-item-link" href="https://www.mozilla.ai/?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=nav&utm_content=about-us" data-link-text="Mozilla.ai" data-link-position="topnav - about"> <h2 class="m24-c-menu-item-title">Mozilla.ai</h2> </a> </section> </li> <li> <section class="m24-c-menu-item"> <a class="m24-c-menu-item-link" href="https://mozilla.vc/?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=nav&utm_content=about-us" data-link-text="Mozilla Ventures" data-link-position="topnav - about"> <h2 class="m24-c-menu-item-title">Mozilla Ventures</h2> </a> </section> </li> <li> <section class="m24-c-menu-item"> <a class="m24-c-menu-item-link" href="/en-US/advertising/" data-link-text="Mozilla Advertising" data-link-position="topnav - about"> <h2 class="m24-c-menu-item-title">Mozilla Advertising</h2> </a> </section> </li> <li> <section class="m24-c-menu-item"> <a class="m24-c-menu-item-link" href="https://builders.mozilla.org/?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=nav&utm_content=about-us" data-link-text="Mozilla Builders" data-link-position="topnav - about"> <h2 class="m24-c-menu-item-title">Mozilla Builders</h2> </a> </section> </li> </ul> </div> </div> </div><!-- close .m24-c-menu-panel-container --> </div><!-- close .m24-c-menu-panel --> </li><!-- close about us --> </ul> </div> </div><!-- close .m24-c-navigation-menu --> </div><!-- close .m24-c-navigation-items --> <blink class="spacer-gif"></blink> </div><!-- close .m24-c-navigation-container --> </div><!-- close .m24-c-navigation-l-content --> </nav> <nav class="c-sub-navigation" aria-labelledby="c-sub-navigation-title"> <div class="mzp-l-content"> <div class="c-sub-navigation-content"> <h2 id="c-sub-navigation-title" class="c-sub-navigation-title"> <a href="/en-US/firefox/" data-link-position="subnav" data-link-text="Firefox"> <img class="c-sub-navigation-icon" src="https://www.mozilla.org/media/protocol/img/logos/firefox/logo.fedb52c912d6.svg" width="24" height="24" alt=""> Firefox </a> </h2> <div class="c-sub-navigation-mobile-toggle is-summary" data-testid="sub-navigation-mobile-toggle"> <span>Menu</span> </div> <ul class="c-sub-navigation-list is-details is-closed" data-testid="sub-navigation-menu"> <li class="c-sub-navigation-item"> <a href="/en-US/firefox/enterprise/" data-link-position="subnav" data-link-text="Enterprise" > Enterprise </a> </li> <li class="c-sub-navigation-item"> <a href="/en-US/firefox/channel/desktop/" data-link-position="subnav" data-link-text="Nightly and Beta" > Nightly and Beta </a> </li> <li class="c-sub-navigation-item"> <a href="/en-US/firefox/all/" data-link-position="subnav" data-link-text="All Languages" > All Languages </a> </li> </ul> </div> </div> </nav> <div id="outer-wrapper"> <main> <div class="mzp-l-content mzp-t-content-md t-center"> <div class="mzp-c-logo mzp-t-logo-xl mzp-t-product-developer mzp-l-logo-center"></div> <h1>Firefox Developer Edition</h1> <p>Welcome to your new favorite browser. 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" data-testid="newsletter-form"> <div hidden> <div id="id_newsletters"><div> <label for="id_newsletters_0"><input type="checkbox" name="newsletters" value="app-dev" id="id_newsletters_0" checked> app-dev</label> </div> </div> </div> <input type="hidden" name="source_url" value="https://www.mozilla.org/en-US/firefox/developer/?utm_source=moz-playground&utm_medium=referral&utm_content=index-hero"> <header class="mzp-c-newsletter-header"> <h3 class="mzp-c-newsletter-title">Get the most out of Firefox Developer Edition</h3> <p class="mzp-c-newsletter-desc">Learn about Dev Edition and subscribe to the Mozilla Developer Newsletter.</p> </header> <fieldset class="mzp-c-newsletter-content"> <div class="mzp-c-form-errors hidden" id="newsletter-errors" data-testid="newsletter-error-message"> <ul class="mzp-u-list-styled"> <li class="error-email-invalid hidden"> Please enter a valid email address </li> <li class="error-select-country hidden"> Please select a country or region </li> <li class="error-select-language hidden"> Please select a language </li> <li class="error-newsletter-checkbox hidden"> Please check at least one of the newsletter options. </li> <li class="error-privacy-policy hidden"> You must agree to the privacy notice </li> <li class="error-try-again-later hidden"> We are sorry, but there was a problem with our system. Please try again later! </li> </ul> </div> <label for="id_email">Your email address:</label> <input type="email" name="email" required data-testid="newsletter-email-input" maxlength="320" placeholder="yourname@example.com" class="mzp-js-email-field" id="id_email"> <div id="newsletter-details" class="mzp-c-newsletter-details"> <div class="mzp-c-newsletter-details-inner"> <label for="id_country">Select country or region:</label> <p><select name="country" required="required" aria-required="true" data-testid="newsletter-country-select" id="id_country"> <option value="af">Afghanistan</option> <option value="qz">Akrotiri</option> <option value="al">Albania</option> <option value="dz">Algeria</option> <option value="as">American Samoa</option> <option value="ad">Andorra</option> <option value="ao">Angola</option> <option value="ai">Anguilla</option> <option value="aq">Antarctica</option> <option value="ag">Antigua and Barbuda</option> <option value="ar">Argentina</option> <option value="am">Armenia</option> <option value="aw">Aruba</option> <option value="xa">Ashmore and Cartier Islands</option> <option value="au">Australia</option> <option value="at">Austria</option> <option value="az">Azerbaijan</option> <option value="bs">Bahamas, The</option> <option value="bh">Bahrain</option> <option value="xb">Baker Island</option> <option value="bd">Bangladesh</option> <option value="bb">Barbados</option> <option value="qs">Bassas da India</option> <option value="by">Belarus</option> <option value="be">Belgium</option> <option value="bz">Belize</option> <option value="bj">Benin</option> <option value="bm">Bermuda</option> <option value="bt">Bhutan</option> <option value="bo">Bolivia</option> <option value="ba">Bosnia and Herzegovina</option> <option value="bw">Botswana</option> <option value="bv">Bouvet Island</option> <option value="br">Brazil</option> <option value="io">British Indian Ocean Territory</option> <option value="bn">Brunei</option> <option value="bg">Bulgaria</option> <option value="bf">Burkina Faso</option> <option value="mm">Burma</option> <option value="bi">Burundi</option> <option value="kh">Cambodia</option> <option value="cm">Cameroon</option> <option value="ca">Canada</option> <option value="cv">Cape Verde</option> <option value="bq">Caribbean Netherlands</option> <option value="ky">Cayman Islands</option> <option value="cf">Central African Republic</option> <option value="td">Chad</option> <option value="cl">Chile</option> <option value="cn">China</option> <option value="cx">Christmas Island</option> <option value="cp">Clipperton Island</option> <option value="cc">Cocos (Keeling) Islands</option> <option value="co">Colombia</option> <option value="km">Comoros</option> <option value="cg">Congo (Brazzaville)</option> <option value="cd">Congo (Kinshasa)</option> <option value="ck">Cook Islands</option> <option value="xc">Coral Sea Islands</option> <option value="cr">Costa Rica</option> <option value="hr">Croatia</option> <option value="cu">Cuba</option> <option value="cw">Curaçao</option> <option value="cy">Cyprus</option> <option value="cz">Czechia</option> <option value="ci">Côte d’Ivoire</option> <option value="dk">Denmark</option> <option value="xd">Dhekelia</option> <option value="dg">Diego Garcia</option> <option value="dj">Djibouti</option> <option value="dm">Dominica</option> <option value="do">Dominican Republic</option> <option value="ec">Ecuador</option> <option value="eg">Egypt</option> <option value="sv">El Salvador</option> <option value="gq">Equatorial Guinea</option> <option value="er">Eritrea</option> <option value="ee">Estonia</option> <option value="sz">Eswatini</option> <option value="et">Ethiopia</option> <option value="xe">Europa Island</option> <option value="fk">Falkland Islands (Islas Malvinas)</option> <option value="fo">Faroe Islands</option> <option value="fj">Fiji</option> <option value="fi">Finland</option> <option value="fr">France</option> <option value="gf">French Guiana</option> <option value="pf">French Polynesia</option> <option value="tf">French Southern and Antarctic Lands</option> <option value="ga">Gabon</option> <option value="gm">Gambia, The</option> <option value="xg">Gaza Strip</option> <option value="ge">Georgia</option> <option value="de">Germany</option> <option value="gh">Ghana</option> <option value="gi">Gibraltar</option> <option value="qx">Glorioso Islands</option> <option value="gr">Greece</option> <option value="gl">Greenland</option> <option value="gd">Grenada</option> <option value="gp">Guadeloupe</option> <option value="gu">Guam</option> <option value="gt">Guatemala</option> <option value="gg">Guernsey</option> <option value="gn">Guinea</option> <option value="gw">Guinea-Bissau</option> <option value="gy">Guyana</option> <option value="ht">Haiti</option> <option value="hm">Heard Island and McDonald Islands</option> <option value="hn">Honduras</option> <option value="hk">Hong Kong</option> <option value="xh">Howland Island</option> <option value="hu">Hungary</option> <option value="is">Iceland</option> <option value="in">India</option> <option value="id">Indonesia</option> <option value="ir">Iran</option> <option value="iq">Iraq</option> <option value="ie">Ireland</option> <option value="im">Isle of Man</option> <option value="il">Israel</option> <option value="it">Italy</option> <option value="jm">Jamaica</option> <option value="xj">Jan Mayen</option> <option value="jp">Japan</option> <option value="xq">Jarvis Island</option> <option value="je">Jersey</option> <option value="xu">Johnston Atoll</option> <option value="jo">Jordan</option> <option value="qu">Juan de Nova Island</option> <option value="kz">Kazakhstan</option> <option value="ke">Kenya</option> <option value="xm">Kingman Reef</option> <option value="ki">Kiribati</option> <option value="kp">Korea, North</option> <option value="kr">Korea, South</option> <option value="xk">Kosovo</option> <option value="kw">Kuwait</option> <option value="kg">Kyrgyzstan</option> <option value="la">Laos</option> <option value="lv">Latvia</option> <option value="lb">Lebanon</option> <option value="ls">Lesotho</option> <option value="lr">Liberia</option> <option value="ly">Libya</option> <option value="li">Liechtenstein</option> <option value="lt">Lithuania</option> <option value="lu">Luxembourg</option> <option value="mo">Macau</option> <option value="mg">Madagascar</option> <option value="mw">Malawi</option> <option value="my">Malaysia</option> <option value="mv">Maldives</option> <option value="ml">Mali</option> <option value="mt">Malta</option> <option value="mh">Marshall Islands</option> <option value="mq">Martinique</option> <option value="mr">Mauritania</option> <option value="mu">Mauritius</option> <option value="yt">Mayotte</option> <option value="mx">Mexico</option> <option value="fm">Micronesia, Federated States of</option> <option value="qm">Midway Islands</option> <option value="md">Moldova</option> <option value="mc">Monaco</option> <option value="mn">Mongolia</option> <option value="me">Montenegro</option> <option value="ms">Montserrat</option> <option value="ma">Morocco</option> <option value="mz">Mozambique</option> <option value="na">Namibia</option> <option value="nr">Nauru</option> <option value="xv">Navassa Island</option> <option value="np">Nepal</option> <option value="nl">Netherlands</option> <option value="nc">New Caledonia</option> <option value="nz">New Zealand</option> <option value="ni">Nicaragua</option> <option value="ne">Niger</option> <option value="ng">Nigeria</option> <option value="nu">Niue</option> <option value="nf">Norfolk Island</option> <option value="mk">North Macedonia</option> <option value="mp">Northern Mariana Islands</option> <option value="no">Norway</option> <option value="om">Oman</option> <option value="pk">Pakistan</option> <option value="pw">Palau</option> <option value="xl">Palmyra Atoll</option> <option value="pa">Panama</option> <option value="pg">Papua New Guinea</option> <option value="xp">Paracel Islands</option> <option value="py">Paraguay</option> <option value="pe">Peru</option> <option value="ph">Philippines</option> <option value="pn">Pitcairn Islands</option> <option value="pl">Poland</option> <option value="pt">Portugal</option> <option value="pr">Puerto Rico</option> <option value="qa">Qatar</option> <option value="ro">Romania</option> <option value="ru">Russia</option> <option value="rw">Rwanda</option> <option value="re">Réunion</option> <option value="bl">Saint Barthélemy</option> <option value="sh">Saint Helena, Ascension, and Tristan da Cunha</option> <option value="kn">Saint Kitts and Nevis</option> <option value="lc">Saint Lucia</option> <option value="mf">Saint Martin</option> <option value="pm">Saint Pierre and Miquelon</option> <option value="vc">Saint Vincent and the Grenadines</option> <option value="ws">Samoa</option> <option value="sm">San Marino</option> <option value="sa">Saudi Arabia</option> <option value="sn">Senegal</option> <option value="rs">Serbia</option> <option value="sc">Seychelles</option> <option value="sl">Sierra Leone</option> <option value="sg">Singapore</option> <option value="sx">Sint Maarten</option> <option value="sk">Slovakia</option> <option value="si">Slovenia</option> <option value="sb">Solomon Islands</option> <option value="so">Somalia</option> <option value="za">South Africa</option> <option value="gs">South Georgia and South Sandwich Islands</option> <option value="ss">South Sudan</option> <option value="es">Spain</option> <option value="xs">Spratly Islands</option> <option value="lk">Sri Lanka</option> <option value="sd">Sudan</option> <option value="sr">Suriname</option> <option value="xr">Svalbard</option> <option value="se">Sweden</option> <option value="ch">Switzerland</option> <option value="sy">Syria</option> <option value="st">São Tomé and Príncipe</option> <option value="tw">Taiwan</option> <option 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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 ga-product-download" id="footer-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="footer-download-win64" data-cta-type="firefox" data-cta-position="footer 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="footer-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="footer-download-win64-msi" data-cta-type="firefox" data-cta-position="footer 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="footer-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="footer-download-win64-aarch64" data-cta-type="firefox" data-cta-position="footer 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="footer-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="footer-download-win" data-cta-type="firefox" data-cta-position="footer 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="footer-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="footer-download-win-msi" data-cta-type="firefox" data-cta-position="footer 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="footer-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="footer-download-osx" data-cta-type="firefox" data-cta-position="footer cta"> <strong class="download-title"> <span>Firefox</span> Developer Edition </strong> </a> </li> <li class="os_linux64"> <a 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