Firefox Developer Edition

<!doctype html> <html class="windows x86 no-js" lang="en" dir="ltr" data-latest-firefox="77.0.1" data-esr-versions="68.9.0" data-gtm-container-id="GTM-MW3R8V" data-stub-attribution-rate="1.0"> <head><script type="text/javascript" src="/_static/js/bundle-playback.js?v=HxkREWBo" charset="utf-8"></script> <script type="text/javascript" src="/_static/js/wombat.js?v=txqj7nKC" charset="utf-8"></script> <script>window.RufflePlayer=window.RufflePlayer||{};window.RufflePlayer.config={"autoplay":"on","unmuteOverlay":"hidden"};</script> <script type="text/javascript" src="/_static/js/ruffle/ruffle.js"></script> <script type="text/javascript"> __wm.init("https://web.archive.org/web"); __wm.wombat("https://www.mozilla.org/en-US/firefox/developer/?utm_source=support.mozilla.org&utm_campaign=footer&utm_medium=referral","20200618101753","https://web.archive.org/","web","/_static/", "1592475473"); </script> <link rel="stylesheet" type="text/css" href="/_static/css/banner-styles.css?v=S1zqJCYt" /> <link 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title="中文 (简体)"> <link rel="alternate" hreflang="zh-TW" href="https://web.archive.org/web/20200618101753/https://www.mozilla.org/zh-TW/firefox/developer/" title="正體中文 (繁體)">    <link href="https://web.archive.org/web/20200618101753cs_/https://www.mozilla.org/media/css/BUNDLES/protocol-core.4989836d5daa.css" rel="stylesheet" type="text/css"/> <link href="https://web.archive.org/web/20200618101753cs_/https://www.mozilla.org/media/css/BUNDLES/firefox_developer.028ab10fdef6.css" rel="stylesheet" type="text/css"/>        <script type="text/javascript" src="https://web.archive.org/web/20200618101753js_/https://www.mozilla.org/media/js/BUNDLES/gtm-snippet.9f9cf2026c5f.js" charset="utf-8"></script>  </head> <body id="firefox-developer" class="html-ltr firefox-developer mzp-t-firefox t-home" data-global-nav-current-link="firefox"> <div id="strings" data-global-close="Close" data-global-next="Next" data-global-previous="Previous"></div> <div class="mzp-c-navigation top-header-navigation mzp-t-firefox mzp-is-sticky"> <div class="mzp-c-navigation-l-content"> <div class="mzp-c-navigation-container"> <button class="mzp-c-navigation-menu-button" type="button" aria-controls="mzp-c-navigation-items">Menu</button> <div class="mzp-c-navigation-logo"> <a href="/web/20200618101753/https://www.mozilla.org/en-US/firefox/" data-link-name="firefox home icon" data-link-type="nav"> Firefox </a> </div> <div class="mzp-c-navigation-items" id="mzp-c-navigation-items"> <div class="mzp-c-navigation-download"> <div class="c-navigation-fxa-cta-container"> <a href="https://web.archive.org/web/20200618101753/https://accounts.firefox.com/signup?entrypoint=mozilla.org-globalnav&form_type=button&utm_source=mozilla.org-globalnav&utm_medium=referral&utm_campaign=navigation&utm_content=get-firefox-account" data-action="https://accounts.firefox.com/" class="js-fxa-cta-link mzp-c-button mzp-t-product mzp-t-secondary mzp-t-small c-navigation-fxa-cta" data-cta-text="Get a Firefox Account" data-cta-type="fxa-sync" data-cta-position="navigation" data-alt-href="/en-US/firefox/accounts/" data-mozillaonline-link="https://accounts.firefox.com.cn/signup?entrypoint=mozilla.org-globalnav&form_type=button&utm_source=mozilla.org-globalnav&utm_medium=referral&utm_campaign=navigation&utm_content=get-firefox-account" data-mozillaonline-action="https://accounts.firefox.com.cn/">Get a Firefox Account</a> <p class="c-navigation-fxa-cta-small-link"><a data-link-type="nav" data-link-name="Check out the Benefits" href="/web/20200618101753/https://www.mozilla.org/en-US/firefox/accounts/">Check out the Benefits</a></p> </div> </div> <div class="mzp-c-navigation-menu"> <nav class="mzp-c-menu mzp-is-basic"> <ul class="mzp-c-menu-category-list"> <li class="mzp-c-menu-category mzp-has-drop-down mzp-js-expandable"> <a class="mzp-c-menu-title" href="/web/20200618101753/https://www.mozilla.org/en-US/firefox/browsers/" aria-haspopup="true" aria-controls="mzp-c-menu-panel-browsers">Browsers</a> <div class="mzp-c-menu-panel mzp-has-card" id="mzp-c-menu-panel-browsers"> <div class="mzp-c-menu-panel-container"> <button class="mzp-c-menu-button-close" type="button" aria-controls="mzp-c-menu-panel-browsers">Close Browsers menu</button> <div class="mzp-c-menu-panel-content"> <ul> <li> <section class="mzp-c-menu-item mzp-has-icon"> <a class="mzp-c-menu-item-link" href="/web/20200618101753/https://www.mozilla.org/en-US/firefox/new/" data-link-name="Firefox Desktop" data-link-type="nav" data-link-position="topnav" data-link-group="browsers"> <svg class="mzp-c-menu-item-icon" xmlns="http://www.w3.org/2000/svg" width="24" height="20" viewbox="0 0 24 20"><g fill="none" fill-rule="evenodd" stroke="#000" stroke-linecap="round" transform="translate(1.77 1)"><rect width="18" height="12" x="1.225" stroke-linejoin="round" stroke-width="2" rx="2"/><path stroke-linejoin="round" stroke-width="2" d="M2.66666667,12 L17.7836298,12 C18.6444906,12 19.4087683,12.5508602 19.6809964,13.3675445 L20.347663,15.3675445 C20.6969586,16.4154311 20.1306386,17.5480711 19.082752,17.8973666 C18.878819,17.9653442 18.6652606,18 18.4502965,18 L2,18 C0.8954305,18 -3.80449182e-13,17.1045695 -3.80584453e-13,16 C-3.80610778e-13,15.7850358 0.034655758,15.5714774 0.102633404,15.3675445 L0.769300071,13.3675445 C1.04152816,12.5508602 1.80580585,12 2.66666667,12 Z"/><path stroke-width="2" d="M6.22514823,15 L14.2251482,15"/></g></svg> <h4 class="mzp-c-menu-item-title">Firefox Browser for Desktop</h4> <p class="mzp-c-menu-item-desc">Get the browser that respects your privacy automatically. On Windows, macOS or Linux.</p> </a> <ul class="mzp-c-menu-item-list"> <li><a href="/web/20200618101753/https://www.mozilla.org/en-US/firefox/new/" data-link-name="Download" data-link-type="nav" data-link-position="subnav" data-link-group="browsers">Download</a></li> <li><a href="/web/20200618101753/https://www.mozilla.org/en-US/firefox/features/" data-link-name="Desktop Features" data-link-type="nav" data-link-position="subnav" data-link-group="browsers">Features</a></li> <li><a href="/web/20200618101753/https://www.mozilla.org/en-US/firefox/notes/" data-link-name="Desktop Release Notes" data-link-type="nav" data-link-position="subnav" data-link-group="browsers">Release Notes</a></li> <li><a href="https://web.archive.org/web/20200618101753/https://addons.mozilla.org/firefox/?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=nav&utm_content=firefox" rel="external noopener" data-link-name="Extensions" data-link-type="nav" data-link-position="subnav" data-link-group="browsers">Extensions</a></li> <li><a href="https://web.archive.org/web/20200618101753/https://support.mozilla.org/products/firefox/?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=nav&utm_content=firefox" rel="external noopener" data-link-name="Support" data-link-type="nav" data-link-position="subnav" data-link-group="browsers">Support</a></li> <li><a href="/web/20200618101753/https://www.mozilla.org/en-US/privacy/firefox/" data-link-name="Desktop Privacy" data-link-type="nav" data-link-position="subnav" data-link-group="browsers">Privacy</a></li> </ul> </section> </li> <li> <section class="mzp-c-menu-item mzp-has-icon"> <a class="mzp-c-menu-item-link" href="/web/20200618101753/https://www.mozilla.org/en-US/firefox/mobile/" data-link-name="Firefox Mobile" data-link-type="nav" data-link-position="topnav" data-link-group="browsers"> <svg class="mzp-c-menu-item-icon" xmlns="http://www.w3.org/2000/svg" width="17" height="24" viewbox="0 0 17 24"><g fill="none" fill-rule="evenodd" stroke="#000" transform="translate(1.5 1)"><rect width="14" height="22" stroke-width="2" rx="2"/><path stroke-width="2" d="M0 4L14 4M0 18L14 18"/></g></svg> <h4 class="mzp-c-menu-item-title">Firefox Browser for Mobile</h4> <p class="mzp-c-menu-item-desc">Take speed, privacy and peace of mind with you. On Android and iOS.</p> </a> <ul class="mzp-c-menu-item-list"> <li><a href="https://web.archive.org/web/20200618101753/https://itunes.apple.com/us/app/firefox-private-safe-browser/id989804926" rel="external noopener" data-link-name="Download for iOS" data-link-type="nav" data-link-position="subnav" data-link-group="browsers">Download for iOS</a></li> <li><a href="https://web.archive.org/web/20200618101753/https://play.google.com/store/apps/details?id=org.mozilla.firefox&referrer=utm_source%3Dmozilla%26utm_medium%3DReferral%26utm_campaign%3Dmozilla-org" rel="external noopener" data-link-name="Download for Android" data-link-type="nav" data-link-position="subnav" data-link-group="browsers">Download for Android</a></li> <li><a href="https://web.archive.org/web/20200618101753/https://support.mozilla.org/products/ios/?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=nav&utm_content=firefox" rel="external noopener" data-link-name="iOS Support" data-link-type="nav" data-link-position="subnav" data-link-group="browsers">iOS Support</a></li> <li><a href="https://web.archive.org/web/20200618101753/https://support.mozilla.org/products/mobile/?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=nav&utm_content=firefox" rel="external noopener" data-link-name="Android Support" data-link-type="nav" data-link-position="subnav" data-link-group="browsers">Android Support</a></li> <li><a href="/web/20200618101753/https://www.mozilla.org/en-US/privacy/firefox/" data-link-name="Mobile Privacy" data-link-type="nav" data-link-position="subnav" data-link-group="browsers">Privacy</a></li> </ul> </section> </li> </ul> <ul> <li> <section class="mzp-c-menu-item mzp-has-icon"> <a class="mzp-c-menu-item-link" href="/web/20200618101753/https://www.mozilla.org/en-US/firefox/enterprise/" data-link-name="Firefox for Enterprise" data-link-type="nav" data-link-position="topnav" data-link-group="browsers"> <svg class="mzp-c-menu-item-icon" width="24" height="24" xmlns="http://www.w3.org/2000/svg"><path d="M20.289 15.5a1 1 0 0 1 1.842.78A11 11 0 1 1 7.6 1.912a1 1 0 0 1 .8 1.834A9 9 0 1 0 20.289 15.5zM23 12a1 1 0 0 1-1 1H12a1 1 0 0 1-1-1V2a1 1 0 0 1 1-1 11 11 0 0 1 11 11zm-4.636-6.364A9 9 0 0 0 13 3.056V11h7.944a9 9 0 0 0-2.58-5.364z" fill="#000" fill-rule="nonzero"/></svg> <h4 class="mzp-c-menu-item-title">Firefox Browser for Enterprise</h4> <p class="mzp-c-menu-item-desc">Get unmatched data protection on the release cadence that suits your organization.</p> </a> </section> </li> <li> <section class="mzp-c-menu-item mzp-has-icon"> <a class="mzp-c-menu-item-link" href="https://web.archive.org/web/20200618101753/https://mixedreality.mozilla.org/?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=nav&utm_content=firefox" rel="external noopener" data-link-name="Firefox Reality" data-link-type="nav" data-link-position="topnav" data-link-group="browsers"> <svg class="mzp-c-menu-item-icon" xmlns="http://www.w3.org/2000/svg" width="24" height="20" viewbox="0 0 24 20"><g fill="none" fill-rule="evenodd" stroke="#000" stroke-linecap="round" transform="translate(1 1)"><path stroke-linejoin="round" stroke-width="2" d="M8,18 C4,18 0,16 0,14 L0,4 C0,5.62640489 4,8 8,8 L8,18 Z"/><path stroke-linejoin="round" stroke-width="2" d="M22,18 C18,18 14,16 14,14 L14,4 C14,5.62640489 18,8 22,8 L22,18 Z" transform="matrix(-1 0 0 1 36 0)"/><path stroke-width="2" d="M0,4 C0,2 5,0 11,0 C17,0 22,2 22,4 L22,14 C22,12 17,11 11,11 C5,11 0,12 0,14 L0,4 Z"/></g></svg> <h4 class="mzp-c-menu-item-title">Firefox Reality</h4> <p class="mzp-c-menu-item-desc">Strap on your goggles and step into the immersive web with Firefox Browser for VR.</p> </a> <ul class="mzp-c-menu-item-list"> <li><a href="https://web.archive.org/web/20200618101753/https://support.mozilla.org/products/firefox-reality/get-started?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=nav&utm_content=firefox" rel="external noopener" data-link-name="Reality Support" data-link-type="nav" data-link-position="subnav" data-link-group="browsers">Support</a></li> <li><a href="/web/20200618101753/https://www.mozilla.org/en-US/privacy/firefox-reality/" data-link-name="Reality Privacy" data-link-type="nav" data-link-position="subnav" data-link-group="browsers">Privacy</a></li> </ul> </section> </li> <li> <section class="mzp-c-menu-item mzp-has-icon"> <a class="mzp-c-menu-item-link" href="https://web.archive.org/web/20200618101753/https://www.amazon.com/Mozilla-Firefox-for-Fire-TV/dp/B078B5YMPD" data-link-name="Firefox for Fire TV" data-link-type="nav" data-link-position="topnav" data-link-group="firefox"> <svg class="mzp-c-menu-item-icon" width="24" height="24" xmlns="http://www.w3.org/2000/svg"><path d="M3 3h18a3 3 0 0 1 3 3v12a3 3 0 0 1-3 3H3a3 3 0 0 1-3-3V6a3 3 0 0 1 3-3zm0 2a1 1 0 0 0-1 1v12a1 1 0 0 0 1 1h18a1 1 0 0 0 1-1V6a1 1 0 0 0-1-1H3zm13.496 6.132a1 1 0 0 1 0 1.736l-7 4A1 1 0 0 1 8 16V8a1 1 0 0 1 1.496-.868l7 4zM10 9.723v4.554L13.984 12 10 9.723z" fill="#000" fill-rule="nonzero"/></svg> <h4 class="mzp-c-menu-item-title">Firefox for Fire TV</h4> <p class="mzp-c-menu-item-desc">Watch videos and browse the internet on your Amazon Fire TV.</p> </a> </section> </li> </ul> </div> <div class="mzp-c-menu-panel-card"> <section class="mzp-c-card mzp-c-card-extra-small mzp-has-aspect-3-2"> <a class="mzp-c-card-block-link" href="/web/20200618101753/https://www.mozilla.org/en-US/firefox/browsers/" data-link-name="All Browsers" data-link-type="nav" data-link-position="card" data-link-group="browsers"> <div class="mzp-c-card-media-wrapper"> <img class="mzp-c-card-image" src="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/img/placeholder.71a50dbba44c.png" data-src="https://web.archive.org/web/20200618101753/https://www.mozilla.org/media/img/nav/cards/browsers.31d180e9831d.jpg" data-srcset="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/img/nav/cards/browsers-high-res.5fa756c8aacf.jpg" alt=""> <noscript> <img class="mzp-c-card-image" src="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/img/nav/cards/browsers.31d180e9831d.jpg" alt=""> </noscript> </div> <div class="mzp-c-card-content"> <h2 class="mzp-c-card-title">Made with respect</h2> <p class="mzp-c-card-desc">Firefox browsers put your privacy first — and always have.</p> </div> </a> </section> </div> </div> </div> </li> <li class="mzp-c-menu-category mzp-has-drop-down mzp-js-expandable"> <a class="mzp-c-menu-title" href="/web/20200618101753/https://www.mozilla.org/en-US/firefox/products/" aria-haspopup="true" aria-controls="mzp-c-menu-panel-products">Products</a> <div class="mzp-c-menu-panel mzp-has-card" id="mzp-c-menu-panel-products"> <div class="mzp-c-menu-panel-container"> <button class="mzp-c-menu-button-close" type="button" aria-controls="mzp-c-menu-panel-products">Close Products menu</button> <div class="mzp-c-menu-panel-content"> <ul> <li> <section class="mzp-c-menu-item mzp-has-icon"> <a class="mzp-c-menu-item-link" href="/web/20200618101753/https://www.mozilla.org/en-US/firefox/lockwise/" data-link-name="Lockwise" data-link-type="nav" data-link-position="topnav" data-link-group="products"> <img class="mzp-c-menu-item-icon" src="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/protocol/img/logos/firefox/lockwise/logo-xs.a84325eb4951.png" class="mzp-c-menu-item-icon" alt="" width="24" height="24" loading="lazy"> <h4 class="mzp-c-menu-item-title">Firefox Lockwise</h4> <p class="mzp-c-menu-item-desc">Take the passwords you’ve saved in Firefox with you everywhere.</p> </a> <ul class="mzp-c-menu-item-list"> <li><a href="https://web.archive.org/web/20200618101753/https://app.adjust.com/6tteyjo?redirect=https%3A%2F%2Fitunes.apple.com%2Fus%2Fapp%2Fid1314000270%3Fmt%3D8&campaign=www.mozilla.org&adgroup=nav-firefox" rel="external noopener" data-link-name="Lockwise iOS" data-link-type="nav" data-link-position="subnav" data-link-group="products">Download for iOS</a></li> <li><a href="https://web.archive.org/web/20200618101753/https://app.adjust.com/6tteyjo?redirect=https%3A%2F%2Fplay.google.com%2Fstore%2Fapps%2Fdetails%3Fid%3Dmozilla.lockbox&campaign=www.mozilla.org&adgroup=nav-firefox" rel="external noopener" data-link-name="Lockwise Android" data-link-type="nav" data-link-position="subnav" data-link-group="products">Download for Android</a></li> <li><a href="https://web.archive.org/web/20200618101753/https://support.mozilla.org/products/firefox-lockwise?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=nav&utm_content=firefox" rel="external noopener" data-link-name="Lockwise Support" data-link-type="nav" data-link-position="subnav" data-link-group="products">Support</a></li> </ul> </section> </li> <li> <section class="mzp-c-menu-item mzp-has-icon"> <a class="mzp-c-menu-item-link" href="https://web.archive.org/web/20200618101753/https://monitor.firefox.com/?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=nav&utm_content=firefox" data-link-name="Monitor" data-link-type="nav" data-link-position="topnav" data-link-group="products"> <img class="mzp-c-menu-item-icon" src="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/protocol/img/logos/firefox/monitor/logo-xs.fc207874f091.png" class="mzp-c-menu-item-icon" alt="" width="24" height="24" loading="lazy"> <h4 class="mzp-c-menu-item-title">Firefox Monitor</h4> <p class="mzp-c-menu-item-desc">See if your personal info has been leaked online, and sign up for future breach alerts.</p> </a> <ul class="mzp-c-menu-item-list"> <li><a href="https://web.archive.org/web/20200618101753/https://monitor.firefox.com/?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=nav&utm_content=firefox" rel="external noopener" data-link-name="Check for Breaches" data-link-type="nav" data-link-position="subnav" data-link-group="products">Check for Breaches</a></li> <li><a href="https://web.archive.org/web/20200618101753/https://monitor.firefox.com/breaches/?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=nav&utm_content=firefox" rel="external noopener" data-link-name="See Breaches" data-link-type="nav" data-link-position="subnav" data-link-group="products">See Breaches</a></li> <li><a href="https://web.archive.org/web/20200618101753/https://monitor.firefox.com/security-tips?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=nav&utm_content=firefox" rel="external noopener" data-link-name="Security Tips" data-link-type="nav" data-link-position="subnav" data-link-group="products">Security Tips</a></li> </ul> </section> </li> </ul> <ul> <li> <section class="mzp-c-menu-item mzp-has-icon"> <a class="mzp-c-menu-item-link" href="https://web.archive.org/web/20200618101753/https://send.firefox.com/?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=nav&utm_content=firefox" data-link-name="Send" data-link-type="nav" data-link-position="topnav" data-link-group="products"> <img class="mzp-c-menu-item-icon" src="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/protocol/img/logos/firefox/send/logo-xs.93de52772ed5.png" class="mzp-c-menu-item-icon" alt="" width="24" height="24" loading="lazy"> <h4 class="mzp-c-menu-item-title">Firefox Send</h4> <p class="mzp-c-menu-item-desc">Share large files safely, with links that ‘self-destruct’.</p> </a> </section> </li> <li> <section class="mzp-c-menu-item mzp-has-icon"> <a class="mzp-c-menu-item-link" href="https://web.archive.org/web/20200618101753/https://getpocket.com/?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=nav&utm_content=firefox" data-link-name="Pocket" data-link-type="nav" data-link-position="topnav" data-link-group="products"> <svg class="mzp-c-menu-item-icon" width="24" height="22" xmlns="http://www.w3.org/2000/svg"><path d="M12 21.5c-6.627 0-12-5.373-12-12v-6a3 3 0 0 1 3-3h18a3 3 0 0 1 3 3v6c0 6.627-5.373 12-12 12zm5.977-15.048a1.485 1.485 0 0 0-1.087.479l-4.923 4.924-4.835-4.851A1.476 1.476 0 0 0 6 6.452a1.5 1.5 0 0 0-1.071 2.55l-.024.016 4.94 4.96 1.06 1.06a1.5 1.5 0 0 0 2.121 0l1.06-1.06 4.964-4.96a1.5 1.5 0 0 0-1.073-2.566z" fill="#FF4056" fill-rule="nonzero"/></svg> <h4 class="mzp-c-menu-item-title">Pocket</h4> <p class="mzp-c-menu-item-desc">Save quality content from anywhere. Fuel your mind everywhere.</p> </a> <ul class="mzp-c-menu-item-list"> <li><a href="https://web.archive.org/web/20200618101753/https://getpocket.com/signup/?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=nav&utm_content=firefox" rel="external noopener" data-link-name="Pocket Sign Up" data-link-type="nav" data-link-position="subnav" data-link-group="products">Sign Up</a></li> <li></li> <li><a href="https://web.archive.org/web/20200618101753/https://app.adjust.com/m54twk?redirect=https%3A%2F%2Fitunes.apple.com%2Fus%2Fapp%2Fpocket-save-read-grow%2Fid309601447&campaign=www.mozilla.org&adgroup=nav-firefox" rel="external noopener" data-link-name="Pocket iOS" data-link-type="nav" data-link-position="subnav" data-link-group="products">Download for iOS</a></li> <li><a href="https://web.archive.org/web/20200618101753/https://app.adjust.com/m54twk?redirect=https%3A%2F%2Fplay.google.com%2Fstore%2Fapps%2Fdetails%3Fid%3Dcom.ideashower.readitlater.pro&campaign=www.mozilla.org&adgroup=nav-firefox" rel="external noopener" data-link-name="Pocket Android" data-link-type="nav" data-link-position="subnav" data-link-group="products">Download for Android</a></li> </ul> </section> </li> </ul> </div> <div class="mzp-c-menu-panel-card"> <section class="mzp-c-card mzp-c-card-extra-small mzp-has-aspect-3-2"> <a class="mzp-c-card-block-link" href="/web/20200618101753/https://www.mozilla.org/en-US/firefox/products/" data-link-name="All Products" data-link-type="nav" data-link-position="card" data-link-group="products"> <div class="mzp-c-card-media-wrapper"> <img class="mzp-c-card-image" src="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/img/placeholder.71a50dbba44c.png" data-src="https://web.archive.org/web/20200618101753/https://www.mozilla.org/media/img/nav/cards/products.5e9149a21cd2.jpg" data-srcset="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/img/nav/cards/products-high-res.6630c561d209.jpg" alt=""> <noscript> <img class="mzp-c-card-image" src="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/img/nav/cards/products.5e9149a21cd2.jpg" alt=""> </noscript> </div> <div class="mzp-c-card-content"> <h2 class="mzp-c-card-title">Connected and protected</h2> <p class="mzp-c-card-desc">Firefox is a whole family of products designed to keep you safer and smarter online.</p> </div> </a> </section> </div> </div> </div> </li> <li class="mzp-c-menu-category mzp-has-drop-down mzp-js-expandable"> <a class="mzp-c-menu-title" href="/web/20200618101753/https://www.mozilla.org/en-US/firefox/accounts/" aria-haspopup="true" aria-controls="mzp-c-menu-panel-join">Join</a> <div class="mzp-c-menu-panel mzp-has-card" id="mzp-c-menu-panel-join"> <div class="mzp-c-menu-panel-container"> <button class="mzp-c-menu-button-close" type="button" aria-controls="mzp-c-menu-panel-join">Close Join menu</button> <div class="mzp-c-menu-panel-content"> <ul> <li> <section class="mzp-c-menu-item mzp-has-icon"> <a class="mzp-c-menu-item-link" href="/web/20200618101753/https://www.mozilla.org/en-US/firefox/accounts/" data-link-name="Join Firefox" data-link-type="nav" data-link-position="topnav" data-link-group="join"> <img class="mzp-c-menu-item-icon" src="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/protocol/img/logos/firefox/logo-xs.87d2c8ccee4b.png" class="mzp-c-menu-item-icon" alt="" width="24" height="24" loading="lazy"> <h4 class="mzp-c-menu-item-title">Join Firefox</h4> <p class="mzp-c-menu-item-desc">Access all of Firefox with a single login — and get more from every product when you do.</p> </a> <ul class="mzp-c-menu-item-list"> <li class="fxa-signin"> <a href="https://web.archive.org/web/20200618101753/https://accounts.firefox.com/signin?entrypoint=mozilla.org-firefoxnav&form_type=button&utm_source=mozilla.org-firefoxnav&utm_medium=referral&utm_campaign=navigation&utm_content=join-sign-in" data-action="https://accounts.firefox.com/" class="js-fxa-cta-link" data-cta-text="Sign In" data-cta-type="fxa-sync" data-cta-position="navigation" data-mozillaonline-link="https://accounts.firefox.com.cn/signin?entrypoint=mozilla.org-firefoxnav&form_type=button&utm_source=mozilla.org-firefoxnav&utm_medium=referral&utm_campaign=navigation&utm_content=join-sign-in" data-mozillaonline-action="https://accounts.firefox.com.cn/">Sign In</a> </li> <li class="fxa-signin"> <a href="https://web.archive.org/web/20200618101753/https://accounts.firefox.com/signup?entrypoint=mozilla.org-firefoxnav&form_type=button&utm_source=mozilla.org-firefoxnav&utm_medium=referral&utm_campaign=navigation&utm_content=join-sign-up" data-action="https://accounts.firefox.com/" class="js-fxa-cta-link" data-cta-text="Sign Up" data-cta-type="fxa-sync" data-cta-position="navigation" data-mozillaonline-link="https://accounts.firefox.com.cn/signup?entrypoint=mozilla.org-firefoxnav&form_type=button&utm_source=mozilla.org-firefoxnav&utm_medium=referral&utm_campaign=navigation&utm_content=join-sign-up" data-mozillaonline-action="https://accounts.firefox.com.cn/">Sign Up</a> </li> <li><a href="/web/20200618101753/https://www.mozilla.org/en-US/firefox/accounts/" data-link-name="Benefits" data-link-type="nav" data-link-position="subnav" data-link-group="browsers">Benefits</a></li> </ul> </section> </li> </ul> </div> <div class="mzp-c-menu-panel-card"> <section class="mzp-c-card mzp-c-card-extra-small mzp-has-aspect-16-9"> <a class="mzp-c-card-block-link" href="/web/20200618101753/https://www.mozilla.org/en-US/firefox/products/" data-link-name="Firefox Family" data-link-type="nav" data-link-position="card" data-link-group="join"> <div class="mzp-c-card-media-wrapper"> <img class="mzp-c-card-image" src="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/img/placeholder.71a50dbba44c.png" data-src="https://web.archive.org/web/20200618101753/https://www.mozilla.org/media/img/nav/cards/master.880ae02e49c3.jpg" data-srcset="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/img/nav/cards/master-high-res.b6408ee28b11.jpg" alt=""> <noscript> <img class="mzp-c-card-image" src="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/img/nav/cards/master.880ae02e49c3.jpg" alt=""> </noscript> </div> <div class="mzp-c-card-content"> <h2 class="mzp-c-card-title">Meet the Firefox Family</h2> <p class="mzp-c-card-desc">Protect your life online with a whole family of privacy-first products.</p> </div> </a> </section> </div> </div> </div> </li> <li class="mzp-c-menu-category mzp-has-drop-down mzp-js-expandable"> <a class="mzp-c-menu-title" href="/web/20200618101753/https://www.mozilla.org/en-US/about/" aria-haspopup="true" aria-controls="mzp-c-menu-panel-about">About</a> <div class="mzp-c-menu-panel mzp-has-card" id="mzp-c-menu-panel-about"> <div class="mzp-c-menu-panel-container"> <button class="mzp-c-menu-button-close" type="button" aria-controls="mzp-c-menu-panel-about">Close About menu</button> <div class="mzp-c-menu-panel-content"> <ul> <li> <section class="mzp-c-menu-item mzp-has-icon"> <a class="mzp-c-menu-item-link" href="https://web.archive.org/web/20200618101753/https://blog.mozilla.org/firefox/?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=nav&utm_content=firefox" data-link-name="Firefox Blog" data-link-type="nav" data-link-position="topnav" data-link-group="about"> <svg class="mzp-c-menu-item-icon" xmlns="http://www.w3.org/2000/svg" width="22" height="24" viewbox="0 0 22 24"><g fill="none" fill-rule="evenodd" stroke="#000" stroke-linecap="round" stroke-linejoin="round" transform="translate(1 1.879)"><path stroke-width="2" d="M9,1.12132031 L2,1.12132031 C0.8954305,1.12132031 5.32907052e-15,2.01675081 5.32907052e-15,3.12132031 L5.32907052e-15,15.1213203 C5.32907052e-15,16.2258898 0.8954305,17.1213203 2,17.1213203 L11,17.1213203 L13,21.1213203 L15,17.1213203 L17,17.1213203 C18.1045695,17.1213203 19,16.2258898 19,15.1213203 L19,9.12132031"/><path stroke-width="2" d="M15.5,0.621320312 C16.3284271,-0.207106783 17.6715729,-0.207106769 18.5,0.621320344 C19.3284271,1.44974746 19.3284271,2.79289318 18.5,3.62132031 L11,11.1213203 L7,12.1213203 L8,8.12132031 L15.5,0.621320312 Z"/></g></svg> <h4 class="mzp-c-menu-item-title">Firefox Blog</h4> <p class="mzp-c-menu-item-desc">Read about new Firefox features, and get tips for staying safer online.</p> </a> </section> </li> <li> <section class="mzp-c-menu-item mzp-has-icon"> <a class="mzp-c-menu-item-link" href="/web/20200618101753/https://www.mozilla.org/en-US/about/" data-link-name="Mozilla" data-link-type="nav" data-link-position="topnav" data-link-group="about"> <svg class="mzp-c-menu-item-icon" width="24" height="24" xmlns="http://www.w3.org/2000/svg"><path d="M6 6.706V6H2v2h2v8H2v2h7v-2H6v-6c.667-1.333 1.5-2 2.5-2s1.833.667 2.5 2v8h5v-2h-3v-6c.667-1.333 1.5-2 2.5-2s1.833.667 2.5 2v8h4v-2h-2v-6c-.667-2.667-2.167-4-4.5-4-1.52 0-2.687.566-3.5 1.699C11.187 6.566 10.02 6 8.5 6c-.98 0-1.814.235-2.5.706zM8.5 4c1.324 0 2.507.327 3.5.97.993-.643 2.176-.97 3.5-.97 3.308 0 5.563 2.004 6.44 5.515l.06.239V14h2v6H0v-6h2v-4H0V4h8c.164.005.331 0 .5 0zM16 14v-3.484a1.845 1.845 0 0 0-.374-.454c-.068-.055-.088-.062-.126-.062-.038 0-.058.007-.126.062-.111.09-.239.239-.374.454V14h1zm-7 0v-3.484a1.845 1.845 0 0 0-.374-.454C8.558 10.007 8.538 10 8.5 10c-.038 0-.058.007-.126.062-.111.09-.239.239-.374.454V14h1z" fill="#000" fill-rule="nonzero"/></svg> <h4 class="mzp-c-menu-item-title">Mozilla</h4> <p class="mzp-c-menu-item-desc">Meet the technology company that puts people before profit.</p> </a> </section> </li> </ul> <ul> <li> <section class="mzp-c-menu-item mzp-has-icon"> <a class="mzp-c-menu-item-link" href="https://web.archive.org/web/20200618101753/https://foundation.mozilla.org/?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=nav&utm_content=firefox" data-link-name="Mozilla Foundation" data-link-type="nav" data-link-position="topnav" data-link-group="about"> <svg class="mzp-c-menu-item-icon" width="24" height="24" xmlns="http://www.w3.org/2000/svg"><path d="M6 6.706V6H2v2h2v8H2v2h7v-2H6v-6c.667-1.333 1.5-2 2.5-2s1.833.667 2.5 2v8h5v-2h-3v-6c.667-1.333 1.5-2 2.5-2s1.833.667 2.5 2v8h4v-2h-2v-6c-.667-2.667-2.167-4-4.5-4-1.52 0-2.687.566-3.5 1.699C11.187 6.566 10.02 6 8.5 6c-.98 0-1.814.235-2.5.706zM8.5 4c1.324 0 2.507.327 3.5.97.993-.643 2.176-.97 3.5-.97 3.308 0 5.563 2.004 6.44 5.515l.06.239V14h2v6H0v-6h2v-4H0V4h8c.164.005.331 0 .5 0zM16 14v-3.484a1.845 1.845 0 0 0-.374-.454c-.068-.055-.088-.062-.126-.062-.038 0-.058.007-.126.062-.111.09-.239.239-.374.454V14h1zm-7 0v-3.484a1.845 1.845 0 0 0-.374-.454C8.558 10.007 8.538 10 8.5 10c-.038 0-.058.007-.126.062-.111.09-.239.239-.374.454V14h1z" fill="#000" fill-rule="nonzero"/></svg> <h4 class="mzp-c-menu-item-title">Mozilla Foundation</h4> <p class="mzp-c-menu-item-desc">The non-profit behind Firefox is fighting for a healthy internet for all.</p> </a> </section> </li> <li> <section class="mzp-c-menu-item mzp-has-icon"> <a class="mzp-c-menu-item-link" href="/web/20200618101753/https://www.mozilla.org/en-US/firefox/privacy/" data-link-name="Privacy" data-link-type="nav" data-link-position="topnav" data-link-group="about"> <svg class="mzp-c-menu-item-icon" xmlns="http://www.w3.org/2000/svg" width="24" height="18" viewbox="0 0 24 18"><g fill="none" fill-rule="evenodd" stroke="#000" stroke-linecap="round" stroke-linejoin="round" transform="translate(1 1)"><path stroke-width="2" d="M0,8 C0,6 5.5,0 11,0 C16.5,0 22,6 22,8 C22,10 16.5,16 11,16 C5.5,16 0,10 0,8 Z"/><path stroke-width="2" d="M11,12 C13.209139,12 15,10.209139 15,8 C15,5.790861 13.209139,4 11,4 C8.790861,4 7,5.790861 7,8 C7,10.209139 8.790861,12 11,12 Z"/><circle cx="13" cy="6" r="1" fill="#000" stroke-width="2"/></g></svg> <h4 class="mzp-c-menu-item-title">Privacy</h4> <p class="mzp-c-menu-item-desc">Learn how Firefox treats your data with respect.</p> </a> </section> </li> </ul> </div> <div class="mzp-c-menu-panel-card"> <section class="mzp-c-card mzp-c-card-extra-small mzp-has-aspect-16-9"> <a class="mzp-c-card-block-link" href="https://web.archive.org/web/20200618101753/https://careers.mozilla.org/?utm_source=www.mozilla.org&utm_medium=referral&utm_campaign=nav&utm_content=firefox" data-link-name="Mozilla Careers" data-link-type="nav" data-link-position="card" data-link-group="about"> <div class="mzp-c-card-media-wrapper"> <img class="mzp-c-card-image" src="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/img/placeholder.71a50dbba44c.png" data-src="https://web.archive.org/web/20200618101753/https://www.mozilla.org/media/img/nav/cards/careers.2a561a8e095b.jpg" data-srcset="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/img/nav/cards/careers-high-res.a5d2a53ba114.jpg" alt=""> <noscript> <img class="mzp-c-card-image" src="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/img/nav/cards/careers.2a561a8e095b.jpg" alt=""> </noscript> </div> <div class="mzp-c-card-content"> <h2 class="mzp-c-card-title">Mozilla Careers</h2> <p class="mzp-c-card-desc">Approach your career with a sense of purpose. Find worthy work at Mozilla.</p> </div> </a> </section> </div> </div> </div> </li> </ul> </nav> </div> </div> </div> </div> </div> <div id="outer-wrapper"> <main role="main"> <section class="t-intro"> <div class="mzp-l-content"> <img class="" src="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/protocol/img/logos/firefox/browser/developer/logo-word-hor-lg.977a1e574948.png" srcset="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/protocol/img/logos/firefox/browser/developer/logo-word-hor-lg-high-res.a18e90a71b15.png 1.5x" alt="" width="368" height="68"> <h1 class="intro-title">Firefox Browser Developer Edition</h1> <p class="intro-tagline">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://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-stub&os=win64&lang=en-US" class="download-link button button-green mzp-c-button mzp-t-product" data-link-type="download" data-download-version="win64" data-download-os="Desktop">Windows 64-bit</a> </li><li><a href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-msi-latest-ssl&os=win64&lang=en-US" class="download-link button button-green mzp-c-button mzp-t-product" data-link-type="download" data-download-version="win64-msi" data-download-os="Desktop">Windows 64-bit MSI</a> </li><li><a href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-stub&os=win&lang=en-US" class="download-link button button-green mzp-c-button mzp-t-product" data-link-type="download" data-download-version="win" data-download-os="Desktop">Windows 32-bit</a> </li><li><a href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-msi-latest-ssl&os=win&lang=en-US" class="download-link button button-green mzp-c-button mzp-t-product" data-link-type="download" data-download-version="win-msi" data-download-os="Desktop">Windows 32-bit MSI</a> </li><li><a href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=osx&lang=en-US" class="download-link button button-green mzp-c-button mzp-t-product" data-link-type="download" data-download-version="osx" data-download-os="Desktop">macOS</a> </li><li><a href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=linux64&lang=en-US" class="download-link button button-green mzp-c-button mzp-t-product" data-link-type="download" data-download-version="linux64" data-download-os="Desktop">Linux 64-bit</a> </li><li><a href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=linux&lang=en-US" class="download-link button button-green mzp-c-button mzp-t-product" data-link-type="download" data-download-version="linux" data-download-os="Desktop">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://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-stub&os=win64&lang=en-US" class="download-link button button-green mzp-c-button mzp-t-product" data-link-type="download" data-download-version="win64" data-download-os="Desktop">Windows 64-bit</a> </li><li><a href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-msi-latest-ssl&os=win64&lang=en-US" class="download-link button button-green mzp-c-button mzp-t-product" data-link-type="download" data-download-version="win64-msi" data-download-os="Desktop">Windows 64-bit MSI</a> </li><li><a href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-stub&os=win&lang=en-US" class="download-link button button-green mzp-c-button mzp-t-product" data-link-type="download" data-download-version="win" data-download-os="Desktop">Windows 32-bit</a> </li><li><a href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-msi-latest-ssl&os=win&lang=en-US" class="download-link button button-green mzp-c-button mzp-t-product" data-link-type="download" data-download-version="win-msi" data-download-os="Desktop">Windows 32-bit MSI</a> </li><li><a href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=osx&lang=en-US" class="download-link button button-green mzp-c-button mzp-t-product" data-link-type="download" data-download-version="osx" data-download-os="Desktop">macOS</a> </li><li><a href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=linux64&lang=en-US" class="download-link button button-green mzp-c-button mzp-t-product" data-link-type="download" data-download-version="linux64" data-download-os="Desktop">Linux 64-bit</a> </li><li><a href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=linux&lang=en-US" class="download-link button button-green mzp-c-button mzp-t-product" data-link-type="download" data-download-version="linux" data-download-os="Desktop">Linux 32-bit</a> </li> </ul> </div> </div> <div class="unsupported-download" data-nosnippet="true"> <p>Your system doesn't meet the <a href="/web/20200618101753/https://www.mozilla.org/en-US/firefox/developer/system-requirements/">requirements</a> to run Firefox.</p> </div> <div class="unsupported-download-osx" data-nosnippet="true"> <p>Your system doesn't meet the <a href="https://web.archive.org/web/20200618101753/https://support.mozilla.org/kb/firefox-osx">requirements</a> to run Firefox.</p> </div> <div class="linux-arm-download" data-nosnippet="true"> <p>Please follow <a href="https://web.archive.org/web/20200618101753/https://support.mozilla.org/kb/install-firefox-linux">these instructions</a> to install Firefox.</p> </div> <ul class="download-list"> <li class="os_win64"> <a class="download-link button button-arrow mzp-c-button mzp-t-product" href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-stub&os=win64&lang=en-US" data-link-type="download" data-display-name="Windows 64-bit" data-download-version="win64" data-download-os="Desktop" data-download-location="primary cta"> <strong class="download-title"> <span>Firefox</span> Developer Edition </strong> </a> </li> <li class="os_win64-msi"> <a class="download-link button button-arrow mzp-c-button mzp-t-product" href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-msi-latest-ssl&os=win64&lang=en-US" data-link-type="download" data-display-name="Windows 64-bit MSI" data-download-version="win64-msi" data-download-os="Desktop" data-download-location="primary cta"> <strong class="download-title"> <span>Firefox</span> Developer Edition </strong> </a> </li> <li class="os_win"> <a class="download-link button button-arrow mzp-c-button mzp-t-product" href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-stub&os=win&lang=en-US" data-link-type="download" data-display-name="Windows 32-bit" data-download-version="win" data-download-os="Desktop" data-download-location="primary cta"> <strong class="download-title"> <span>Firefox</span> Developer Edition </strong> </a> </li> <li class="os_win-msi"> <a class="download-link button button-arrow mzp-c-button mzp-t-product" href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-msi-latest-ssl&os=win&lang=en-US" data-link-type="download" data-display-name="Windows 32-bit MSI" data-download-version="win-msi" data-download-os="Desktop" data-download-location="primary cta"> <strong class="download-title"> <span>Firefox</span> Developer Edition </strong> </a> </li> <li class="os_osx"> <a class="download-link button button-arrow mzp-c-button mzp-t-product" href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=osx&lang=en-US" data-link-type="download" data-display-name="macOS" data-download-version="osx" data-download-os="Desktop" data-download-location="primary cta"> <strong class="download-title"> <span>Firefox</span> Developer Edition </strong> </a> </li> <li class="os_linux64"> <a class="download-link button button-arrow mzp-c-button mzp-t-product" href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=linux64&lang=en-US" data-link-type="download" data-display-name="Linux 64-bit" data-download-version="linux64" data-download-os="Desktop" data-download-location="primary cta"> <strong class="download-title"> <span>Firefox</span> Developer Edition </strong> </a> </li> <li class="os_linux"> <a class="download-link button button-arrow mzp-c-button mzp-t-product" href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=linux&lang=en-US" data-link-type="download" data-display-name="Linux 32-bit" data-download-version="linux" data-download-os="Desktop" data-download-location="primary cta"> <strong class="download-title"> <span>Firefox</span> Developer Edition </strong> </a> </li> </ul> <small class="fx-privacy-link mzp-c-button-download-privacy-link"> <a href="/web/20200618101753/https://www.mozilla.org/en-US/privacy/firefox/"> Firefox Privacy Notice </a> </small> </div> <p class="intro-feedback-note"> Firefox Developer Edition automatically sends feedback to Mozilla. <a href="/web/20200618101753/https://www.mozilla.org/en-US/privacy/firefox/#pre-release" class="more">Learn more</a> </p> </div> <div class="intro-image"> <img class="" src="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/img/firefox/developer/hero-screenshot.baf6dd693658.png" srcset="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/img/firefox/developer/hero-screenshot-high-res.45fbecfeecba.png 1.5x" alt="" width="1200" height="337"> </div> </section> <section class="mzp-l-content t-performance" id="nextgen"> <div class="mzp-c-card-feature mzp-has-aspect-3-2 mzp-l-card-feature-left-half"> <div class="mzp-c-card-feature-media-wrapper"> <div class="mzp-c-card-feature-media"> <img src="/web/20200618101753im_/https://www.mozilla.org/media/img/firefox/developer/stylo-engine.svg" alt=""> </div> </div> <div class="mzp-c-card-feature-content"> <div class="mzp-c-card-feature-content-container"> <h2 class="mzp-c-card-feature-title">Firefox Browser Developer Edition</h2> <div class="mzp-c-card-feature-desc"> <p class="c-subtitle">The browser made for developers</p> <p> All the latest developer tools in beta, plus <strong>experimental features</strong> 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> </div> </div> </section> <section class="t-highlights mzp-l-content"> <div class="c-gallery-grid"> <div class="c-gallery-item" id="devtools"> <a href="https://web.archive.org/web/20200618101753/https://hacks.mozilla.org/2019/10/firefox-70-a-bountiful-release-for-all/#developertools" rel="external"> <img class="highlight-image" src="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/img/firefox/developer/hero-inactive-css.40a2e0b8ddb1.png" srcset="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/img/firefox/developer/hero-inactive-css-high-res.87cdf3a5bf40.png 1.5x" alt="Inactive CSS"> </a> <h2 class="c-title">New Tools</h2> <h3 class="c-subtitle">Inactive CSS</h3> <p> 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><a class="mzp-c-cta-link" rel="external" href="https://web.archive.org/web/20200618101753/https://hacks.mozilla.org/2019/10/firefox-70-a-bountiful-release-for-all/#developertools">Learn more</a></p> </div> <div class="c-gallery-item" id="devtools"> <a href="https://web.archive.org/web/20200618101753/https://mozilladevelopers.github.io/playground/debugger/" rel="external"> <img class="highlight-image" src="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/img/firefox/developer/hero-debugger-ani.7e04d95e76ea.gif" alt="_('Firefox DevTools')"> </a> <h2 class="c-title">New Tools</h2> <h3 class="c-subtitle">Firefox DevTools</h3> <p> 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><a class="mzp-c-cta-link" rel="external" href="https://web.archive.org/web/20200618101753/https://mozilladevelopers.github.io/playground/debugger/">Learn more</a></p> </div> <div class="c-gallery-item" id="cssgrid"> <a href="https://web.archive.org/web/20200618101753/https://mozilladevelopers.github.io/playground/css-grid/" rel="external"> <img class="highlight-image" src="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/img/firefox/developer/hero-cssgrid-ani.c0a7ace9dbf7.gif" alt="_('Master CSS Grid')"> </a> <h2 class="c-title">Innovative Features</h2> <h3 class="c-subtitle">Master CSS Grid</h3> <p> 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><a class="mzp-c-cta-link" rel="external" href="https://web.archive.org/web/20200618101753/https://mozilladevelopers.github.io/playground/css-grid/">Learn more</a></p> </div> <div class="c-gallery-item"> <a rel="external" href="https://web.archive.org/web/20200618101753/https://developer.mozilla.org/docs/Tools/Page_Inspector/How_to/Edit_fonts"> <img class="highlight-image" src="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/img/firefox/developer/hero-fonts.0e574b98aa63.gif" alt="_('Fonts Panel')"> </a> <h2 class="c-title">Faster Information</h2> <h3 class="c-subtitle">Fonts Panel</h3> <p> 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><a class="mzp-c-cta-link" rel="external" href="https://web.archive.org/web/20200618101753/https://developer.mozilla.org/docs/Tools/Page_Inspector/How_to/Edit_fonts">Learn more</a></p> </div> </div> </section> <section class="t-features mzp-l-content"> <h2 class="c-title"><span>Design. Code. Test. Refine.</span></h2> <h3 class="c-subtitle">Build and Perfect your sites<br> with Firefox DevTools</h3> <ul class="c-gallery-grid"> <li class="c-gallery-item"> <img class="c-feature-img" src="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/img/firefox/developer/feature-inspector.35e75cc1e376.svg" alt=""> <h3 class="c-feature-name">Inspector</h3> <p class="c-feature-desc"> Inspect and refine code to build pixel-perfect layouts. <p class="c-feature-more"><a href="https://web.archive.org/web/20200618101753/https://developer.mozilla.org/docs/Tools/Page_Inspector" class="mzp-c-cta-link" rel="external">Learn more about Page Inspector</a></p> </p> </li> <li class="c-gallery-item"> <img class="c-feature-img" src="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/img/firefox/developer/feature-console.b6dd52efcc7f.svg" alt=""> <h3 class="c-feature-name">Console</h3> <p class="c-feature-desc"> Track CSS, JavaScript, security and network issues. <p class="c-feature-more"><a href="https://web.archive.org/web/20200618101753/https://developer.mozilla.org/docs/Tools/Web_Console" class="mzp-c-cta-link" rel="external">Learn more about Web Console</a></p> </p> </li> <li class="c-gallery-item"> <img class="c-feature-img" src="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/img/firefox/developer/feature-debugger.eb8b25a35291.svg" alt=""> <h3 class="c-feature-name">Debugger</h3> <p class="c-feature-desc"> Powerful JavaScript debugger with support for your framework. <p class="c-feature-more"><a href="https://web.archive.org/web/20200618101753/https://developer.mozilla.org/docs/Tools/Debugger" class="mzp-c-cta-link" rel="external">Learn more about JavaScript Debugger</a></p> </p> </li> <li class="c-gallery-item"> <img class="c-feature-img" src="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/img/firefox/developer/feature-network.c64ea51a34de.svg" alt=""> <h3 class="c-feature-name">Network</h3> <p class="c-feature-desc"> Monitor network requests that can slow or block your site. <p class="c-feature-more"><a href="https://web.archive.org/web/20200618101753/https://developer.mozilla.org/docs/Tools/Network_Monitor" class="mzp-c-cta-link" rel="external">Learn more about Network Monitor</a></p> </p> </li> <li class="c-gallery-item"> <img class="c-feature-img" src="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/img/firefox/developer/feature-storage.61859e2d2627.svg" alt=""> <h3 class="c-feature-name">Storage panel</h3> <p class="c-feature-desc"> Add, modify and remove cache, cookies, databases and session data. <p class="c-feature-more"><a href="https://web.archive.org/web/20200618101753/https://developer.mozilla.org/docs/Tools/Storage_Inspector" class="mzp-c-cta-link" rel="external">Learn more about Storage Panel</a></p> </p> </li> <li class="c-gallery-item"> <img class="c-feature-img" src="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/img/firefox/developer/feature-responsive-mode.2d162490fbcd.svg" alt=""> <h3 class="c-feature-name">Responsive Design Mode</h3> <p class="c-feature-desc"> Test sites on emulated devices in your browser. <p class="c-feature-more"><a href="https://web.archive.org/web/20200618101753/https://developer.mozilla.org/docs/Tools/Responsive_Design_View" class="mzp-c-cta-link" rel="external">Learn more about Responsive Design View</a></p> </p> </li> <li class="c-gallery-item"> <img class="c-feature-img" src="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/img/firefox/developer/feature-visual-editing.3b68a6c300ca.svg" alt=""> <h3 class="c-feature-name">Visual Editing</h3> <p class="c-feature-desc"> Fine-tune animations, alignment and padding. <p class="c-feature-more"><a href="https://web.archive.org/web/20200618101753/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> </p> </li> <li class="c-gallery-item"> <img class="c-feature-img" src="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/img/firefox/developer/feature-performance.f9dc51d3311b.svg" alt=""> <h3 class="c-feature-name">Performance</h3> <p class="c-feature-desc"> Unblock bottlenecks, streamline processes, optimize assets. <p class="c-feature-more"><a href="https://web.archive.org/web/20200618101753/https://developer.mozilla.org/docs/Tools/Performance" class="mzp-c-cta-link" rel="external">Learn more about Performance Tools</a></p> </p> </li> <li class="c-gallery-item"> <img class="c-feature-img" src="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/img/firefox/developer/feature-memory.0e3890974c3f.svg" alt=""> <h3 class="c-feature-name">Memory</h3> <p class="c-feature-desc"> Find memory leaks and make your application zippy. <p class="c-feature-more"><a href="https://web.archive.org/web/20200618101753/https://developer.mozilla.org/docs/Tools/Memory" class="mzp-c-cta-link" rel="external">Learn more about Memory Tools</a></p> </p> </li> <li class="c-gallery-item"> <img class="c-feature-img" src="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/img/firefox/developer/feature-style-editor.6de1bd8ae46c.svg" alt=""> <h3 class="c-feature-name">Style Editor</h3> <p class="c-feature-desc"> Edit and manage all your CSS stylesheets in your browser. <p class="c-feature-more"><a href="https://web.archive.org/web/20200618101753/https://developer.mozilla.org/docs/Tools/Style_Editor" class="mzp-c-cta-link" rel="external">Learn more about Style Editor</a></p> </p> </li> </ul> </section> <section class="t-engage mzp-t-dark"> <div class="mzp-l-content t-do"> <section class="mzp-c-card-picto mzp-c-card-picto-compact t-speak-up"> <div class="mzp-c-card-picto-content"> <h3 class="mzp-c-card-picto-title">Speak up</h3> <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://web.archive.org/web/20200618101753/https://discourse.mozilla.org/c/devtools">Join the conversation</a></p> </div> </section> <section class="mzp-c-card-picto mzp-c-card-picto-compact t-get-involved"> <div class="mzp-c-card-picto-content"> <h3 class="mzp-c-card-picto-title">Get involved</h3> <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://web.archive.org/web/20200618101753/https://firefox-dev.tools/">Start now</a></p> </div> </section> </div> <div class="mzp-l-content t-download"> <section class="mzp-c-card-feature mzp-has-aspect-3-2 mzp-l-card-feature-right-half"> <div class="mzp-c-card-feature-media-wrapper"> <div class="mzp-c-card-feature-media"> <img class="" src="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/img/firefox/developer/browser.a6cc14615f6f.png" srcset="https://web.archive.org/web/20200618101753im_/https://www.mozilla.org/media/img/firefox/developer/browser-high-res.233175f07965.png 1.5x" alt="" width="334" height="228"> </div> </div> <div class="mzp-c-card-feature-content"> <div class="mzp-c-card-feature-content-container"> <h2 class="mzp-c-card-feature-title">Download the Firefox browser made for developers</h2> <div class="mzp-c-card-feature-desc"> <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://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-stub&os=win64&lang=en-US" class="download-link button button-green mzp-c-button mzp-t-product" data-link-type="download" data-download-version="win64" data-download-os="Desktop">Windows 64-bit</a> </li><li><a href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-msi-latest-ssl&os=win64&lang=en-US" class="download-link button button-green mzp-c-button mzp-t-product" data-link-type="download" data-download-version="win64-msi" data-download-os="Desktop">Windows 64-bit MSI</a> </li><li><a href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-stub&os=win&lang=en-US" class="download-link button button-green mzp-c-button mzp-t-product" data-link-type="download" data-download-version="win" data-download-os="Desktop">Windows 32-bit</a> </li><li><a href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-msi-latest-ssl&os=win&lang=en-US" class="download-link button button-green mzp-c-button mzp-t-product" data-link-type="download" data-download-version="win-msi" data-download-os="Desktop">Windows 32-bit MSI</a> </li><li><a href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=osx&lang=en-US" class="download-link button button-green mzp-c-button mzp-t-product" data-link-type="download" data-download-version="osx" data-download-os="Desktop">macOS</a> </li><li><a href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=linux64&lang=en-US" class="download-link button button-green mzp-c-button mzp-t-product" data-link-type="download" data-download-version="linux64" data-download-os="Desktop">Linux 64-bit</a> </li><li><a href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=linux&lang=en-US" class="download-link button button-green mzp-c-button mzp-t-product" data-link-type="download" data-download-version="linux" data-download-os="Desktop">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://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-stub&os=win64&lang=en-US" class="download-link button button-green mzp-c-button mzp-t-product" data-link-type="download" data-download-version="win64" data-download-os="Desktop">Windows 64-bit</a> </li><li><a href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-msi-latest-ssl&os=win64&lang=en-US" class="download-link button button-green mzp-c-button mzp-t-product" data-link-type="download" data-download-version="win64-msi" data-download-os="Desktop">Windows 64-bit MSI</a> </li><li><a href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-stub&os=win&lang=en-US" class="download-link button button-green mzp-c-button mzp-t-product" data-link-type="download" data-download-version="win" data-download-os="Desktop">Windows 32-bit</a> </li><li><a href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-msi-latest-ssl&os=win&lang=en-US" class="download-link button button-green mzp-c-button mzp-t-product" data-link-type="download" data-download-version="win-msi" data-download-os="Desktop">Windows 32-bit MSI</a> </li><li><a href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=osx&lang=en-US" class="download-link button button-green mzp-c-button mzp-t-product" data-link-type="download" data-download-version="osx" data-download-os="Desktop">macOS</a> </li><li><a href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=linux64&lang=en-US" class="download-link button button-green mzp-c-button mzp-t-product" data-link-type="download" data-download-version="linux64" data-download-os="Desktop">Linux 64-bit</a> </li><li><a href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=linux&lang=en-US" class="download-link button button-green mzp-c-button mzp-t-product" data-link-type="download" data-download-version="linux" data-download-os="Desktop">Linux 32-bit</a> </li> </ul> </div> </div> <div class="unsupported-download" data-nosnippet="true"> <p>Your system doesn't meet the <a href="/web/20200618101753/https://www.mozilla.org/en-US/firefox/developer/system-requirements/">requirements</a> to run Firefox.</p> </div> <div class="unsupported-download-osx" data-nosnippet="true"> <p>Your system doesn't meet the <a href="https://web.archive.org/web/20200618101753/https://support.mozilla.org/kb/firefox-osx">requirements</a> to run Firefox.</p> </div> <div class="linux-arm-download" data-nosnippet="true"> <p>Please follow <a href="https://web.archive.org/web/20200618101753/https://support.mozilla.org/kb/install-firefox-linux">these instructions</a> to install Firefox.</p> </div> <ul class="download-list"> <li class="os_win64"> <a class="download-link button button-arrow mzp-c-button mzp-t-product" href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-stub&os=win64&lang=en-US" data-link-type="download" data-display-name="Windows 64-bit" data-download-version="win64" data-download-os="Desktop" data-download-location="footer cta"> <strong class="download-title"> <span>Firefox</span> Developer Edition </strong> </a> </li> <li class="os_win64-msi"> <a class="download-link button button-arrow mzp-c-button mzp-t-product" href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-msi-latest-ssl&os=win64&lang=en-US" data-link-type="download" data-display-name="Windows 64-bit MSI" data-download-version="win64-msi" data-download-os="Desktop" data-download-location="footer cta"> <strong class="download-title"> <span>Firefox</span> Developer Edition </strong> </a> </li> <li class="os_win"> <a class="download-link button button-arrow mzp-c-button mzp-t-product" href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-stub&os=win&lang=en-US" data-link-type="download" data-display-name="Windows 32-bit" data-download-version="win" data-download-os="Desktop" data-download-location="footer cta"> <strong class="download-title"> <span>Firefox</span> Developer Edition </strong> </a> </li> <li class="os_win-msi"> <a class="download-link button button-arrow mzp-c-button mzp-t-product" href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-msi-latest-ssl&os=win&lang=en-US" data-link-type="download" data-display-name="Windows 32-bit MSI" data-download-version="win-msi" data-download-os="Desktop" data-download-location="footer cta"> <strong class="download-title"> <span>Firefox</span> Developer Edition </strong> </a> </li> <li class="os_osx"> <a class="download-link button button-arrow mzp-c-button mzp-t-product" href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=osx&lang=en-US" data-link-type="download" data-display-name="macOS" data-download-version="osx" data-download-os="Desktop" data-download-location="footer cta"> <strong class="download-title"> <span>Firefox</span> Developer Edition </strong> </a> </li> <li class="os_linux64"> <a class="download-link button button-arrow mzp-c-button mzp-t-product" href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=linux64&lang=en-US" data-link-type="download" data-display-name="Linux 64-bit" data-download-version="linux64" data-download-os="Desktop" data-download-location="footer cta"> <strong class="download-title"> <span>Firefox</span> Developer Edition </strong> </a> </li> <li class="os_linux"> <a class="download-link button button-arrow mzp-c-button mzp-t-product" href="https://web.archive.org/web/20200618101753/https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=linux&lang=en-US" data-link-type="download" data-display-name="Linux 32-bit" data-download-version="linux" data-download-os="Desktop" data-download-location="footer cta"> <strong class="download-title"> <span>Firefox</span> Developer Edition </strong> </a> </li> </ul> <small class="fx-privacy-link mzp-c-button-download-privacy-link"> <a href="/web/20200618101753/https://www.mozilla.org/en-US/privacy/firefox/"> Firefox Privacy Notice </a> </small> </div> </div> </div> </div> </section> </div> </section> <section class="t-newsletter"> <div class="mzp-l-content"> <form id="newsletter-form" class="mzp-c-newsletter-form" action="/web/20200618101753/https://www.mozilla.org/en-US/newsletter/" method="post"> <input type="hidden" name="newsletters" value="app-dev" id="id_newsletters"> <input type="hidden" name="source_url" 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