{ "schema_version": 2, "slug": "firefox", "name": "Mozilla Firefox (en-US)", "publisher": "Mozilla", "author": "Mozilla Foundation", "ids": { "winget": "Mozilla.Firefox", "moniker": "firefox", "homebrew_cask": "firefox" }, "platforms": [ "windows", "macos" ], "summary": "Mozilla Firefox is free and open source software, built by a community of thousands from all over the world.", "description": "Firefox Browser, also known as Mozilla Firefox or simply Firefox, is a free and open-source web browser developed by the Mozilla Foundation and its subsidiary, the Mozilla Corporation. Firefox uses the Gecko layout engine to render web pages, which implements current and anticipated web standards. In 2017, Firefox began incorporating new technology under the code name Quantum to promote parallelism and a more intuitive user interface. Firefox is officially available for Windows 7 or newer, macOS, and Linux. Its unofficial ports are available for various Unix and Unix-like operating systems including FreeBSD, OpenBSD, NetBSD, illumos, and Solaris Unix.", "tags": [ "browser", "gecko", "internet", "quantum", "spidermonkey", "web", "web-browser", "webpage" ], "locale": "en-US", "urls": { "homepage": "https://www.mozilla.org/firefox/", "publisher": "https://www.mozilla.org/", "support": "https://support.mozilla.org/", "privacy": "https://www.mozilla.org/privacy/firefox/", "release_notes": "https://www.firefox.com/en-US/firefox/159.0/releasenotes/" }, "license": { "name": "MPL-2.0", "url": "https://www.mozilla.org/MPL/2.0", "spdx": "MPL-2.0", "copyright": "© Firefox and Mozilla Developers; available under the MPL 2 license.", "copyright_url": "https://www.mozilla.org/foundation/trademarks/policy" }, "pricing": { "status": "open-source", "source": "derived-from-license" }, "latest_versions": { "windows": "159.0", "macos": "159.0.1" }, "last_updated": "2026-10-27", "versions_total": { "windows": 183, "macos": 1 }, "versions": [ { "platform": "windows", "version": "159.0", "release_date": "2026-10-27", "release_notes": "Version 159.0, first offered to Release channel users on October 27, 2026\n\nNew\n- Sharing on macOS now uses the native macOS share picker, which shows a preview of the page and recent contacts alongside AirDrop, Messages, and other apps. Several selected tabs can also be shared at once.\n\n- Saved passwords are now available from the sidebar by default, without having to add the Passwords tool first.\n\n- Smart Window can now watch pages for changes such as price drops or restocks. Type /watch in the chat to set one up, and Firefox sends a desktop notification when it finds a match. Watches can be managed from the Tasks button in the toolbar or the about:smartwindowtasks page.\n This feature is part of a progressive roll out.\n What is a progressive roll out?\n Certain new Firefox features are released gradually. This means some users will see the feature before everyone does. This approach helps to get early feedback to catch bugs and improve behavior quickly, meaning more Firefox users overall have a better experience.\n\nFixed\n- Fixed the file upload dialog opening in the last folder a file was saved to, such as Downloads, instead of the folder last used for uploads.\n- Fixed memory usage growing rapidly when sites such as the Zoom web app were left open in a minimized window.\n- Fixed some videos displaying incorrectly on Windows when NVIDIA RTX Video HDR is enabled.\n- Fixed bookmarks not being imported from Google Chrome profiles that are signed in to a Google account.\n- Fixed the Replace button in Apple Writing Tools on macOS inserting the clipboard contents instead of the rewritten text on some sites, such as Gmail.\n- Fixed long drop-down lists on web pages sometimes showing blank space in place of the last options until the list was scrolled.\n- Fixed some sites, such as Slack, failing to load instead of falling back to HTTP/2 when the site rejected an HTTP/3 request.\n- Fixed Firefox using excessive memory on Linux with AMD graphics when viewing map or place results on sites such as ChatGPT.\n- Fixed quick gamepad button presses sometimes being missed in web games on macOS.\n- Fixed tabs sometimes detaching into a new window when clicked on Linux with Wayland.\n- Fixed menus and panels fading in on Windows and Linux when animation effects are turned off in the operating system.\n- Various security fixes.\n\nChanged\n- On macOS, apps that sign in through the default browser, such as ChatGPT, now open their sign-in page in Firefox instead of Safari when Firefox is the default browser.\n- The AI chatbot's Summarize page option now sends the page's address to the chatbot provider instead of the page's text, so long pages are no longer cut short to a partial summary.\n- Open tabs can now be searched with a keyboard shortcut: Ctrl+Shift+A on Windows and Linux, Cmd+Shift+A on macOS. The Extensions and Themes shortcut is now Ctrl+Shift+F on Windows and Linux, and Cmd+Shift+E on macOS. These shortcuts can be changed in about:keyboard.\n- Web addresses written in the Javanese, Balinese, Canadian Aboriginal Syllabics, and N'Ko scripts are now displayed in their own script instead of as encoded \"xn--\" text.\n\nEnterprise\n- For Firefox Enterprise updates and fixes, see the Firefox Enterprise release notes. For policy changes, see the Firefox admin docs changelog.\n\nDeveloper\n- The Web Console now allows let, const, and class variables to be declared again, so a snippet can be edited and re-run without a redeclaration error.\n\nWeb Platform\n- Firefox now supports scroll-driven animations, so CSS animations and Web Animations API animations can progress with the scroll position of a container or with an element's visibility as it scrolls into view. This adds the animation-timeline, scroll-timeline, view-timeline, and animation-range properties and the ScrollTimeline and ViewTimeline interfaces.\n- Firefox now supports scoped custom element registries. A registry created with the CustomElementRegistry() constructor is separate from the global window.customElements registry, so custom elements that share a tag name can coexist on the same page.\n- On compatible devices, WebGL now supports the EXT_clip_control and EXT_texture_mirror_clamp_to_edge extensions and WebGL 2 supports EXT_texture_norm16.\n- The Sanitizer API now sanitizes HTML as it is parsed rather than afterwards, so custom element constructors no longer run for elements the sanitizer removes.\n\nCommunity Contributions\n- With the release of Firefox 159, we are pleased to welcome the developers who contributed their first code change to Firefox in this release, 12 of whom were brand new volunteers! Please join us in thanking each of these diligent and enthusiastic individuals, and take a look at their contributions:\n - Abhinav Singh: 2070629\n - Atharva Wadodkar[:atharva]: 2070702\n - corpus_e: 2070325\n - csalinezh: 1970969\n - Dmitry Gozman: 2076389\n - eldjiikgull (EDS): 2076744\n - Fabio: 1735401\n - Feng Yu: 2073811\n - Jaron: 2069726\n - Jason Salerno: 2076831\n - Lander Feldman: 2067952\n - 赤坂理子：2044440", "release_notes_url": "https://www.firefox.com/en-US/firefox/159.0/releasenotes/", "manifest_version": "1.28.0", "manifest_dir": "manifests/m/Mozilla/Firefox/159.0", "installers": [ { "platform": "windows", "architecture": "x86", "type": "nullsoft", "scope": "machine", "url": "https://download-installer.cdn.mozilla.net/pub/firefox/releases/159.0/win32/en-US/Firefox%20Setup%20159.0.exe", "host": "download-installer.cdn.mozilla.net", "filename": "Firefox Setup 159.0.exe", "sha256": "2f0943a2cb926ca532bfd0e5ca87b0ffad21919dfd858cfd2c7252e53e17fa85", "product_code": "Mozilla Firefox", "switches": { "silent": "/S /PreventRebootRequired=true", "silent_with_progress": "/S /PreventRebootRequired=true", "install_location": "/InstallDirectoryPath=\"\"" }, "upgrade_behavior": "install", "protocols": [ "http", "https", "mailto" ], "file_extensions": [ "avif", "htm", "html", "pdf", "shtml", "svg", "webp", "xht", "xhtml" ] }, { "platform": "windows", "architecture": "x64", "type": "nullsoft", "scope": "machine", "url": "https://download-installer.cdn.mozilla.net/pub/firefox/releases/159.0/win64/en-US/Firefox%20Setup%20159.0.exe", "host": "download-installer.cdn.mozilla.net", "filename": "Firefox Setup 159.0.exe", "sha256": "8776887b79925abbdd407fcdfe257d8382b54e24be52a6466426b95a804d6790", "product_code": "Mozilla Firefox", "switches": { "silent": "/S /PreventRebootRequired=true", "silent_with_progress": "/S /PreventRebootRequired=true", "install_location": "/InstallDirectoryPath=\"\"" }, "upgrade_behavior": "install", "protocols": [ "http", "https", "mailto" ], "file_extensions": [ "avif", "htm", "html", "pdf", "shtml", "svg", "webp", "xht", "xhtml" ] }, { "platform": "windows", "architecture": "arm64", "type": "nullsoft", "scope": "machine", "url": "https://download-installer.cdn.mozilla.net/pub/firefox/releases/159.0/win64-aarch64/en-US/Firefox%20Setup%20159.0.exe", "host": "download-installer.cdn.mozilla.net", "filename": "Firefox Setup 159.0.exe", "sha256": "f486b1562409fec209d05261f8862000b9e885dce473cafad87ac36e6d8eafc7", "product_code": "Mozilla Firefox", "switches": { "silent": "/S /PreventRebootRequired=true", "silent_with_progress": "/S /PreventRebootRequired=true", "install_location": "/InstallDirectoryPath=\"\"" }, "upgrade_behavior": "install", "protocols": [ "http", "https", "mailto" ], "file_extensions": [ "avif", "htm", "html", "pdf", "shtml", "svg", "webp", "xht", "xhtml" ] } ] }, { "platform": "windows", "version": "158.0.1", "release_date": "2026-10-20", "release_notes": "Version 158.0.1, first offered to Release channel users on October 20, 2026\n\nFixed\n- Mozilla blocked compromised eMudhra intermediate certificates via OneCRL on October 17th. The blocks were distributed to clients via Remote Settings the same day. This update contains the updated OneCRL block list, ensuring clients will block the compromised certificates even if RemoteSettings is disabled by policy or otherwise unavailable in the user's network environment. (Learn More)\n- Fixed an issue where pages would unexpectedly scroll back to the top when selecting text. (Bug 2081016)\n- Fixed a crash on Windows when printing or saving a page as PDF while a screen reader or other assistive technology was running. (Bug 2082376)\n- Fixed an issue where Firefox was opening windows on the wrong monitor in multi-monitor setups on Linux. (Bug 2076558)\n- Fixed an issue that could prevent the built-in VPN from turning on for some users. (Bug 2055094)\n- Fixed an issue where files dragged into Firefox from other applications were not dropped onto the page on macOS. (Bug 2078954)\n- Various security fixes.", "release_notes_url": "https://www.firefox.com/en-US/firefox/158.0.1/releasenotes/", "manifest_version": "1.12.0", "manifest_dir": "manifests/m/Mozilla/Firefox/158.0.1", "installers": [ { "platform": "windows", "architecture": "x86", "type": "nullsoft", "scope": "machine", "url": "https://download-installer.cdn.mozilla.net/pub/firefox/releases/158.0.1/win32/en-US/Firefox%20Setup%20158.0.1.exe", "host": "download-installer.cdn.mozilla.net", "filename": "Firefox Setup 158.0.1.exe", "sha256": "798c87934e70bb2748982fc39ff81b9369dc8b4979e3766448c7ccc59c9a4e51", "product_code": "Mozilla Firefox", "switches": { "silent": "/S /PreventRebootRequired=true", "silent_with_progress": "/S /PreventRebootRequired=true", "install_location": "/InstallDirectoryPath=\"\"" }, "upgrade_behavior": "install", "protocols": [ "http", "https", "mailto" ], "file_extensions": [ "avif", "htm", "html", "pdf", "shtml", "svg", "webp", "xht", "xhtml" ] }, { "platform": "windows", "architecture": "x64", "type": "nullsoft", "scope": "machine", "url": "https://download-installer.cdn.mozilla.net/pub/firefox/releases/158.0.1/win64/en-US/Firefox%20Setup%20158.0.1.exe", "host": "download-installer.cdn.mozilla.net", "filename": "Firefox Setup 158.0.1.exe", "sha256": "3259a2f8508e58cf2e383b6c99bfc64d6ddc86d1407b7c2f86f660af955b5d10", "product_code": "Mozilla Firefox", "switches": { "silent": "/S /PreventRebootRequired=true", "silent_with_progress": "/S /PreventRebootRequired=true", "install_location": "/InstallDirectoryPath=\"\"" }, "upgrade_behavior": "install", "protocols": [ "http", "https", "mailto" ], "file_extensions": [ "avif", "htm", "html", "pdf", "shtml", "svg", "webp", "xht", "xhtml" ] }, { "platform": "windows", "architecture": "arm64", "type": "nullsoft", "scope": "machine", "url": "https://download-installer.cdn.mozilla.net/pub/firefox/releases/158.0.1/win64-aarch64/en-US/Firefox%20Setup%20158.0.1.exe", "host": "download-installer.cdn.mozilla.net", "filename": "Firefox Setup 158.0.1.exe", "sha256": "ae0f16fcd07be9deff7c2815f85f4f3d2e84f86d9176ea2309858ddd93c1381f", "product_code": "Mozilla Firefox", "switches": { "silent": "/S /PreventRebootRequired=true", "silent_with_progress": "/S /PreventRebootRequired=true", "install_location": "/InstallDirectoryPath=\"\"" }, "upgrade_behavior": "install", "protocols": [ "http", "https", "mailto" ], "file_extensions": [ "avif", "htm", "html", "pdf", "shtml", "svg", "webp", "xht", "xhtml" ] } ] }, { "platform": "windows", "version": "158.0", "release_date": "2026-10-13", "release_notes": "Version 158.0, first offered to Release channel users on October 13, 2026\n\nNew\n- You can now fill in forms faster in Smart Window. When clicking into a form field or selecting Fill from sources, Smart Window will now suggest data to use based on your relevant open tabs and saved autofill data.\n This feature is part of a progressive roll out.\n What is a progressive roll out?\n Certain new Firefox features are released gradually. This means some users will see the feature before everyone does. This approach helps to get early feedback to catch bugs and improve behavior quickly, meaning more Firefox users overall have a better experience.\n- Firefox now creates more accessible PDFs when saving a page as PDF, and when printing on Linux and macOS. This also fixes a variety of PDF rendering issues, such as missing math symbols.\n- Firefox now supports the JPEG XL image format, which generally has better compression than WebP, JPEG, PNG, and GIF.\n- New Tab now keeps a library of custom wallpapers under Your images, rather than only the most recent one.\n- Firefox's translations feature now supports the following languages:\n - Albanian\n - Belarusian\n - Filipino\n\nFixed\n- Fixed website icons (favicons) in address bar results blending into the highlight color when selecting a result with the keyboard on Ubuntu's default theme.\n- Fixed a crash that could occur while Firefox loaded website icons (favicons).\n- Fixed the first letter of each search engine's name being underlined in the Unified Search Button menu in the address bar on Windows and Linux, which could cause conflicting keyboard shortcuts.\n- Fixed menus such as List all tabs, Settings, and Unified Search being hard to read with a Windows High Contrast theme. Menu background and text colors now follow the Background and Text colors chosen for a custom contrast theme in Windows Settings.\n- Various security fixes.\n\nChanged\n- Firefox no longer rounds scroll positions to whole screen pixels. Scrolling is now smoother and more precise, especially on high-resolution displays or when a page is zoomed.\n\nEnterprise\n- For Firefox Enterprise updates and fixes, see the Firefox Enterprise release notes. For policy changes, see the Firefox admin docs changelog.\n\nDeveloper\n- Fixed an issue where the Network Monitor could miss WebSocket messages if they arrived immediately after a connection was established.\n\nWeb Platform\n- Firefox now supports typed arithmetic in CSS calc(), allowing units to be multiplied and divided within math functions.\n- Added support for the navigate option for the Notification constructor and ServiceWorkerRegistration.showNotification(), which specifies a URL to navigate to when the notification is clicked.\n- The WebAuthn conditional UI is now shown on input elements with an autocomplete=\"webauthn\" attribute. Previously, it was only shown when the attribute included another autofill field value, such as autocomplete=\"username webauthn\". (Learn more)\n- Firefox now supports the cache value for PerformanceResourceTiming.deliveryType, allowing websites to identify resources served from the HTTP cache.\n- The WebGL extension EXT_polygon_offset_clamp is now available on compatible devices.\n\nCommunity Contributions\n- With the release of Firefox 158, we are pleased to welcome the developers who contributed their first code change to Firefox in this release, 20 of whom were brand new volunteers! Please join us in thanking each of these diligent and enthusiastic individuals, and take a look at their contributions:\n - :cat: 2071142\n - Adham: 1985986\n - Anand Balaji: 2072754\n - Calvin Lei-Cramer: 1975584\n - Collins Kubu: 2069323\n - Daniel mungai chege: 2072565\n - f3tch [:f3tchcodes]: 1492357, 1917288, 1957843, 2068045, 2070577\n - foued: 2070398\n - harry75369: 2000420, 2006226, 2071759\n - HojunCho: 2066829\n - ianlewisuk1: 2072737\n - Jakub Stasiak [:jstasiak]: 1719394\n - Lavindeep: 2069768\n - Ole Baumann [:darkintaqt]: 2070873\n - Rehan: 1688932\n - Ruslan Semchenko: 105707, 2041999, 2071549\n - Sho Sakuma: 2072520\n - Thomas Nibler [:tnibler]: 2071644, 2072008, 2072750\n - Vir Patel: 1865119, 2073619\n - Yeet: 1973441", "release_notes_url": "https://www.firefox.com/en-US/firefox/158.0/releasenotes/", "manifest_version": "1.12.0", "manifest_dir": "manifests/m/Mozilla/Firefox/158.0", "installers": [ { "platform": "windows", "architecture": "x86", "type": "nullsoft", "scope": "machine", "url": "https://download-installer.cdn.mozilla.net/pub/firefox/releases/158.0/win32/en-US/Firefox%20Setup%20158.0.exe", "host": "download-installer.cdn.mozilla.net", "filename": "Firefox Setup 158.0.exe", "sha256": "8a6ca25e8c522bd82324269fd8b79da3784426a84c96260f1c017e60cadff777", "product_code": "Mozilla Firefox", "switches": { "silent": "/S /PreventRebootRequired=true", "silent_with_progress": "/S /PreventRebootRequired=true", "install_location": "/InstallDirectoryPath=\"\"" }, "upgrade_behavior": "install", "protocols": [ "http", "https", "mailto" ], "file_extensions": [ "avif", "htm", "html", "pdf", "shtml", "svg", "webp", "xht", "xhtml" ] }, { "platform": "windows", "architecture": "x64", "type": "nullsoft", "scope": "machine", "url": "https://download-installer.cdn.mozilla.net/pub/firefox/releases/158.0/win64/en-US/Firefox%20Setup%20158.0.exe", "host": "download-installer.cdn.mozilla.net", "filename": "Firefox Setup 158.0.exe", "sha256": "450ab1c772e02f0c9ef02f489b153d86c45bd9311b202d10dc233f3c0206f8d1", "product_code": "Mozilla Firefox", "switches": { "silent": "/S /PreventRebootRequired=true", "silent_with_progress": "/S /PreventRebootRequired=true", "install_location": "/InstallDirectoryPath=\"\"" }, "upgrade_behavior": "install", "protocols": [ "http", "https", "mailto" ], "file_extensions": [ "avif", "htm", "html", "pdf", "shtml", "svg", "webp", "xht", "xhtml" ] }, { "platform": "windows", "architecture": "arm64", "type": "nullsoft", "scope": "machine", "url": "https://download-installer.cdn.mozilla.net/pub/firefox/releases/158.0/win64-aarch64/en-US/Firefox%20Setup%20158.0.exe", "host": "download-installer.cdn.mozilla.net", "filename": "Firefox Setup 158.0.exe", "sha256": "1afa1553de5fffc80b4828f986ef7f5f8407181547aa440f2851449e58a934be", "product_code": "Mozilla Firefox", "switches": { "silent": "/S /PreventRebootRequired=true", "silent_with_progress": "/S /PreventRebootRequired=true", "install_location": "/InstallDirectoryPath=\"\"" }, "upgrade_behavior": "install", "protocols": [ "http", "https", "mailto" ], "file_extensions": [ "avif", "htm", "html", "pdf", "shtml", "svg", "webp", "xht", "xhtml" ] } ] }, { "platform": "windows", "version": "157.0.1", "release_date": "2026-10-06", "release_notes": "Version 157.0.1, first offered to Release channel users on October 6, 2026\n\nFixed\n- Fixed downloads failing on macOS when Firefox is set to ask where to save files but doesn't have permission to access the Downloads folder. (Bug 2077390)\n- Fixed the sidebar getting stuck on the Bookmarks or AI Chatbot panel for some users. (Bug 2076296)\n- Fixed the Restore from Backup option not appearing during onboarding on Windows. (Bug 2073401)\n- Security fix.\n- Reference link to 157.0 release notes.", "release_notes_url": "https://www.firefox.com/en-US/firefox/157.0.1/releasenotes/", "manifest_version": "1.12.0", "manifest_dir": "manifests/m/Mozilla/Firefox/157.0.1", "installers": [ { "platform": "windows", "architecture": "x86", "type": "nullsoft", "scope": "machine", "url": "https://download-installer.cdn.mozilla.net/pub/firefox/releases/157.0.1/win32/en-US/Firefox%20Setup%20157.0.1.exe", "host": "download-installer.cdn.mozilla.net", "filename": "Firefox Setup 157.0.1.exe", "sha256": "1cc3e56ceacb222446d8057c75baf078c616c3e5be6a862c50c1e1a0ec09697a", "product_code": "Mozilla Firefox", "switches": { "silent": "/S /PreventRebootRequired=true", "silent_with_progress": "/S /PreventRebootRequired=true", "install_location": "/InstallDirectoryPath=\"\"" }, "upgrade_behavior": "install", "protocols": [ "http", "https", "mailto" ], "file_extensions": [ "avif", "htm", "html", "pdf", "shtml", "svg", "webp", "xht", "xhtml" ] }, { "platform": "windows", "architecture": "x64", "type": "nullsoft", "scope": "machine", "url": "https://download-installer.cdn.mozilla.net/pub/firefox/releases/157.0.1/win64/en-US/Firefox%20Setup%20157.0.1.exe", "host": "download-installer.cdn.mozilla.net", "filename": "Firefox Setup 157.0.1.exe", "sha256": "71dc620e7749bb65be6df67b99261a303805a804f9c787b76b81c095cfa7d9ca", "product_code": "Mozilla Firefox", "switches": { "silent": "/S /PreventRebootRequired=true", "silent_with_progress": "/S /PreventRebootRequired=true", "install_location": "/InstallDirectoryPath=\"\"" }, "upgrade_behavior": "install", "protocols": [ "http", "https", "mailto" ], "file_extensions": [ "avif", "htm", "html", "pdf", "shtml", "svg", "webp", "xht", "xhtml" ] }, { "platform": "windows", "architecture": "arm64", "type": "nullsoft", "scope": "machine", "url": "https://download-installer.cdn.mozilla.net/pub/firefox/releases/157.0.1/win64-aarch64/en-US/Firefox%20Setup%20157.0.1.exe", "host": "download-installer.cdn.mozilla.net", "filename": "Firefox Setup 157.0.1.exe", "sha256": "fc86cd7e73b68e876770852bf4741b046441069ad57cee88626311cad12a7206", "product_code": "Mozilla Firefox", "switches": { "silent": "/S /PreventRebootRequired=true", "silent_with_progress": "/S /PreventRebootRequired=true", "install_location": "/InstallDirectoryPath=\"\"" }, "upgrade_behavior": "install", "protocols": [ "http", "https", "mailto" ], "file_extensions": [ "avif", "htm", "html", "pdf", "shtml", "svg", "webp", "xht", "xhtml" ] } ] }, { "platform": "windows", "version": "157.0", "release_date": "2026-09-29", "release_notes": "Version 157.0, first offered to Release channel users on September 29, 2026\n\nNew\n- \n Firefox's biggest visual refresh in years is now available, with a modernized look across the browser toolbars, sidebar, menus and individual features, built with our updated design system. It also includes:\n - New built-in themes with light and dark versions, to personalize the look of Firefox in one click.\n - A new compact mode that reduces toolbar and tab spacing to leave more room for web content, useful on smaller screens and in split-screen layouts.\n- WebRTC video calls can now use hardware AV1 decoding on devices that support it, instead of always decoding AV1 video in software.\n- Firefox now shows a warning in the site information panel (the shield icon in the address bar) and in Settings when it has been set up to record its encryption keys, which could let other software on the computer read encrypted web traffic.\n- Firefox Suggest now offers suggestions in the address bar in Austria, Belgium, Czech Republic, Denmark, Finland, Hungary, Ireland, Luxembourg, Netherlands, Norway, Poland, Portugal, Slovakia, Spain, Sweden, and Switzerland. They can be controlled in the Firefox Suggest settings. Learn more.\n\nFixed\n- Fixed video from phones and tablets appearing sideways or upside down in WebRTC calls.\n- Fixed the address bar searching for the typed text instead of opening the selected suggestion when a page was still loading, such as shortly after Firefox started.\n- Fixed some HDR videos encoded in 8-bit color formats looking dull and gray on Windows instead of displaying in HDR.\n- Improved audio and video synchronization when repeatedly changing the playback speed of videos, for example on YouTube.\n- Fixed the Vertical Tabs sidebar not reappearing when the cursor moves to the edge of the screen in full screen mode.\n- Fixed an issue on Windows where making a video full screen would leave the Windows taskbar showing over the video.\n- Various security fixes.\n\nChanged\n- Pressing Tab now moves focus straight to the text field of the address bar and search bar instead of stopping on the search engine button first. The button can still be reached with Shift+Tab.\n- Amazon is no longer included as a built-in search engine. It can still be added as a custom search engine in the search settings. Learn more.\n- The updated sidebar is now enabled for everyone. Anyone still using the previous sidebar will keep a similar layout, with the panel switcher at the top of the sidebar. Additionally, the “Show sidebar” option has been removed from Settings.\n While we continue to refine the new design, the previous sidebar version can still be restored by setting sidebar.revamp to false in about:config. This also turns off vertical tabs. The preference will remain available until the end of 2027.\n- Web page alert(), confirm() and prompt() dialogs, the color and date pickers, and form autocomplete drop-downs now match the page's light or dark color scheme.\n\nEnterprise\n- You can find information about policy updates and enterprise-specific bug fixes in the Firefox for Enterprise 157 Release Notes.\n\nDeveloper\n\nWeb Platform\n- Firefox now supports the at-rule() function for @supports. This allows authors to detect browser support for specific at-rules, such as @supports at-rule(@scope).\n- Firefox now supports the chain value for the CSS overscroll-behavior property.\n\nCommunity Contributions\n- With the release of Firefox 157, we are pleased to welcome the developers who contributed their first code change to Firefox in this release, 21 of whom were brand new volunteers! Please join us in thanking each of these diligent and enthusiastic individuals, and take a look at their contributions:\n - Alexander Gankov: 2033184\n - Amadi: 2053549, 2053553, 2065302, 2066478\n - Andrew: 2031465\n - Caleb Pickard: 2058970\n - David Torcivia: 2057758\n - dchen705: 2065655\n - Ekerin Agboola: 2064541\n - Giddeon Card: 2067328\n - gustavokrm: 2051536\n - Hanzala Sohrab: 2068111\n - Ivan Smagin: 2061540\n - Jieke Jiang: 2067179\n - Nazeer Ahmed Shaikh: 1703780, 2064544\n - Noah Varghese: 1625924, 2021799\n - perdomojuan755: 2069230\n - Raúl: 2066877\n - Rév O'Conner: 1594489\n - Samuel Mbabhazi: 2054228\n - sfshah: 2004273, 2067302\n - Valerie Racine (:v-racine): 1849963\n - Xiaosen Zhuang: 2069280", "release_notes_url": "https://www.firefox.com/en-US/firefox/157.0/releasenotes/", "manifest_version": "1.12.0", "manifest_dir": "manifests/m/Mozilla/Firefox/157.0", "installers": [ { "platform": "windows", "architecture": "x86", "type": "nullsoft", "scope": "machine", "url": "https://download-installer.cdn.mozilla.net/pub/firefox/releases/157.0/win32/en-US/Firefox%20Setup%20157.0.exe", "host": "download-installer.cdn.mozilla.net", "filename": "Firefox Setup 157.0.exe", "sha256": "e74c47e51599631ed9513df97375f2731082f2e7fbe624a539ef9f038ec7f79a", "product_code": "Mozilla Firefox", "switches": { "silent": "/S /PreventRebootRequired=true", "silent_with_progress": "/S /PreventRebootRequired=true", "install_location": "/InstallDirectoryPath=\"\"" }, "upgrade_behavior": "install", "protocols": [ "http", "https", "mailto" ], "file_extensions": [ "avif", "htm", "html", "pdf", "shtml", "svg", "webp", "xht", "xhtml" ] }, { "platform": "windows", "architecture": "x64", "type": "nullsoft", "scope": "machine", "url": "https://download-installer.cdn.mozilla.net/pub/firefox/releases/157.0/win64/en-US/Firefox%20Setup%20157.0.exe", "host": "download-installer.cdn.mozilla.net", "filename": "Firefox Setup 157.0.exe", "sha256": "58c90afab6e4b9a6b34d2958fe06d1a143dd9226ea8834377e5cd45e815936d7", "product_code": "Mozilla Firefox", "switches": { "silent": "/S /PreventRebootRequired=true", "silent_with_progress": "/S /PreventRebootRequired=true", "install_location": "/InstallDirectoryPath=\"\"" }, "upgrade_behavior": "install", "protocols": [ "http", "https", "mailto" ], "file_extensions": [ "avif", "htm", "html", "pdf", "shtml", "svg", "webp", "xht", "xhtml" ] }, { "platform": "windows", "architecture": "arm64", "type": "nullsoft", "scope": "machine", "url": "https://download-installer.cdn.mozilla.net/pub/firefox/releases/157.0/win64-aarch64/en-US/Firefox%20Setup%20157.0.exe", "host": "download-installer.cdn.mozilla.net", "filename": "Firefox Setup 157.0.exe", "sha256": "511f539825c249db351eb0616db8c7860c49dbd39499264105081e7536fcf670", "product_code": "Mozilla Firefox", "switches": { "silent": "/S /PreventRebootRequired=true", "silent_with_progress": "/S /PreventRebootRequired=true", "install_location": "/InstallDirectoryPath=\"\"" }, "upgrade_behavior": "install", "protocols": [ "http", "https", "mailto" ], "file_extensions": [ "avif", "htm", "html", "pdf", "shtml", "svg", "webp", "xht", "xhtml" ] } ] }, { "platform": "windows", "version": "156.0.1", "release_date": "2026-09-22", "release_notes": "Version 156.0.1, first offered to Release channel users on September 22, 2026\n\nFixed\n- Fixed the NVDA screen reader not announcing address bar buttons when the mouse pointer moves over them. (Bug 2069276)\n- Fixed elements inside a link not showing their CSS :active styles while being clicked. (Bug 2067272)\n- Fixed Firefox becoming unresponsive on some pages that use CSS anchor positioning. (Bug 2070171)\n- Fixed Firefox windows on macOS 27 immediately returning to maximized after being restored by double-clicking the title bar. (Bug 2066632)\n- Fixed Firefox leaking system handles on Windows as content processes were started and stopped. (Bug 2069644)\n- Reference link to 156.0 release notes.", "release_notes_url": "https://www.firefox.com/en-US/firefox/156.0.1/releasenotes/", "manifest_version": "1.12.0", "manifest_dir": "manifests/m/Mozilla/Firefox/156.0.1", "installers": [ { "platform": "windows", "architecture": "x86", "type": "nullsoft", "scope": "machine", "url": "https://download-installer.cdn.mozilla.net/pub/firefox/releases/156.0.1/win32/en-US/Firefox%20Setup%20156.0.1.exe", "host": "download-installer.cdn.mozilla.net", "filename": "Firefox Setup 156.0.1.exe", "sha256": "a9c641b3e5dbd8b8ab545f3e18ca2c43d740669a8a03e60076ca58a3ac38a84c", "product_code": "Mozilla Firefox", "switches": { "silent": "/S /PreventRebootRequired=true", "silent_with_progress": "/S /PreventRebootRequired=true", "install_location": "/InstallDirectoryPath=\"\"" }, "upgrade_behavior": "install", "protocols": [ "http", "https", "mailto" ], "file_extensions": [ "avif", "htm", "html", "pdf", "shtml", "svg", "webp", "xht", "xhtml" ] }, { "platform": "windows", "architecture": "x64", "type": "nullsoft", "scope": "machine", "url": "https://download-installer.cdn.mozilla.net/pub/firefox/releases/156.0.1/win64/en-US/Firefox%20Setup%20156.0.1.exe", "host": "download-installer.cdn.mozilla.net", "filename": "Firefox Setup 156.0.1.exe", "sha256": "e69ff3fb4c585f88c947a673dedcfa6c346a5092881a6e6b618005821030bc67", "product_code": "Mozilla Firefox", "switches": { "silent": "/S /PreventRebootRequired=true", "silent_with_progress": "/S /PreventRebootRequired=true", "install_location": "/InstallDirectoryPath=\"\"" }, "upgrade_behavior": "install", "protocols": [ "http", "https", "mailto" ], "file_extensions": [ "avif", "htm", "html", "pdf", "shtml", "svg", "webp", "xht", "xhtml" ] }, { "platform": "windows", "architecture": "arm64", "type": "nullsoft", "scope": "machine", "url": "https://download-installer.cdn.mozilla.net/pub/firefox/releases/156.0.1/win64-aarch64/en-US/Firefox%20Setup%20156.0.1.exe", "host": "download-installer.cdn.mozilla.net", "filename": "Firefox Setup 156.0.1.exe", "sha256": "1cef5f572d33d6413d1cf44f4b8fb8ddc7a8fc0dacb08c74e7144b2b7f978dd1", "product_code": "Mozilla Firefox", "switches": { "silent": "/S /PreventRebootRequired=true", "silent_with_progress": "/S /PreventRebootRequired=true", "install_location": "/InstallDirectoryPath=\"\"" }, "upgrade_behavior": "install", "protocols": [ "http", "https", "mailto" ], "file_extensions": [ "avif", "htm", "html", "pdf", "shtml", "svg", "webp", "xht", "xhtml" ] } ] }, { "platform": "windows", "version": "156.0", "release_date": "2026-09-15", "release_notes": "Version 156.0, first offered to Release channel users on September 15, 2026\n\nNew\n- Firefox on macOS can now be set to open automatically when the computer starts up, from the Startup section of Settings.\n- Localized Wikipedia and occasional sponsored suggestions in the address bar are now available in France, Germany, and Italy. These suggestions can be turned off in Firefox Suggest settings.\n\nFixed\n- Fixed an issue where dragging an image to a new position in a rich-text editor could replace it with a long line of text instead of moving it.\n- Fixed high-sample-rate FLAC audio in MP4 failing to play on sites such as Bilibili.\n- Fixed subtitles not appearing in the Picture-in-Picture window when they are turned on in the video player after the window has already opened.\n- Fixed bookmarks moving out of their folder when the folder and the bookmarks inside it were selected and dragged together in the Bookmarks sidebar.\n- Fixed the find bar becoming permanently unavailable in a tab after reversing the panes in Split View.\n- Fixed some sites failing to load when DNS over HTTPS is enabled and the site does not support HTTPS.\n- Fixed Firefox losing all network connectivity for some users with the built-in VPN enabled.\n- Fixed an issue on Windows where Firefox could block an auto-hiding taskbar from showing.\n- Various security fixes.\n\nChanged\n- Firefox's built-in PDF viewer now starts up to 45% faster.\n- Improved memory and CPU usage when Firefox displays large JPEG images scaled down to fit a page.\n- On Windows devices with ARM64 processors, WebRTC video calls may now use hardware H264 decoding instead of falling back to software.\n\nEnterprise\n- You can find information about policy updates and enterprise-specific bug fixes in the Firefox for Enterprise 156 Release Notes.\n\nDeveloper\n\nWeb Platform\n- text-box-trim now uses the font metrics of a ::first-line pseudo-element when one applies, matching other browsers and the specification.\n\nCommunity Contributions\n- With the release of Firefox 156, we are pleased to welcome the developers who contributed their first code change to Firefox in this release, 10 of whom were brand new volunteers! Please join us in thanking each of these diligent and enthusiastic individuals, and take a look at their contributions:\n - Aaron Ma: 2063818\n - Dominik Bay [:eimann]: 2066736\n - ExplodingJoysticks: 1728637, 1890400, 1910664, 1928343, 1944206, 2000658, 2003000, 2059911, 2061541\n - Gopalarathnam Venkatesan: 2003172, 2042426, 2062096, 2062952, 2062989\n - Hugo Osvaldo Barrera: 2063808\n - Kana: 2062133\n - Kerissa Grubb: 2042422\n - Louis-Philippe Manette: 2062972, 2063867\n - Seunghyun An: 2063033\n - William McDonald: 1034964", "release_notes_url": "https://www.firefox.com/en-US/firefox/156.0/releasenotes/", "manifest_version": "1.12.0", "manifest_dir": "manifests/m/Mozilla/Firefox/156.0", "installers": [ { "platform": "windows", "architecture": "x86", "type": "nullsoft", "scope": "machine", "url": "https://download-installer.cdn.mozilla.net/pub/firefox/releases/156.0/win32/en-US/Firefox%20Setup%20156.0.exe", "host": "download-installer.cdn.mozilla.net", "filename": "Firefox Setup 156.0.exe", "sha256": "a8252f8133bd373235a58202ffa2a676e1de73e4ebefb9d6c6a9251da1a4b368", "product_code": "Mozilla Firefox", "switches": { "silent": "/S /PreventRebootRequired=true", "silent_with_progress": "/S /PreventRebootRequired=true", "install_location": "/InstallDirectoryPath=\"\"" }, "upgrade_behavior": "install", "protocols": [ "http", "https", "mailto" ], "file_extensions": [ "avif", "htm", "html", "pdf", "shtml", "svg", "webp", "xht", "xhtml" ] }, { "platform": "windows", "architecture": "x64", "type": "nullsoft", "scope": "machine", "url": "https://download-installer.cdn.mozilla.net/pub/firefox/releases/156.0/win64/en-US/Firefox%20Setup%20156.0.exe", "host": "download-installer.cdn.mozilla.net", "filename": "Firefox Setup 156.0.exe", "sha256": "86a027237f7408e8a4d18637c57d487455a704cbb2466a32d0d14c2207d2699a", "product_code": "Mozilla Firefox", "switches": { "silent": "/S /PreventRebootRequired=true", "silent_with_progress": "/S /PreventRebootRequired=true", "install_location": "/InstallDirectoryPath=\"\"" }, "upgrade_behavior": "install", "protocols": [ "http", "https", "mailto" ], "file_extensions": [ "avif", "htm", "html", "pdf", "shtml", "svg", "webp", "xht", "xhtml" ] }, { "platform": "windows", "architecture": "arm64", "type": "nullsoft", "scope": "machine", "url": "https://download-installer.cdn.mozilla.net/pub/firefox/releases/156.0/win64-aarch64/en-US/Firefox%20Setup%20156.0.exe", "host": "download-installer.cdn.mozilla.net", "filename": "Firefox Setup 156.0.exe", "sha256": "6a51462fa456728c90db840bae43f27b30f49f56e038006b5ac4c4eaecc57003", "product_code": "Mozilla Firefox", "switches": { "silent": "/S /PreventRebootRequired=true", "silent_with_progress": "/S /PreventRebootRequired=true", "install_location": "/InstallDirectoryPath=\"\"" }, "upgrade_behavior": "install", "protocols": [ "http", "https", "mailto" ], "file_extensions": [ "avif", "htm", "html", "pdf", "shtml", "svg", "webp", "xht", "xhtml" ] } ] }, { "platform": "windows", "version": "155.0.1", "release_date": "2026-09-04", "release_notes": "Version 155.0.1, first offered to Release channel users on September 4, 2026\n\nFixed\n- Fixed Firefox becoming unresponsive on some pages that use CSS blur and backdrop filters together. (Bug 2068836)\n- Fixed the sidebar not reappearing after restarting Firefox when the \"Hide tabs and sidebar\" option was turned on. (Bug 2065431)\n- Fixed some profile icons not being displayed in the account and application menus. (Bug 2064729, Bug 2067734)\n- Fixed the current device being listed among connected devices in the account menu. (Bug 2059763)\n- Reference link to 155.0 release notes.\n\nUnresolved\n- Standard dynamic range (SDR) video in some formats can appear washed out on macOS. The issue is under investigation and a fix will ship in a future release. (Bug 2068961)", "release_notes_url": "https://www.firefox.com/en-US/firefox/155.0.1/releasenotes/", "manifest_version": "1.12.0", "manifest_dir": "manifests/m/Mozilla/Firefox/155.0.1", "installers": [ { "platform": "windows", "architecture": "x86", "type": "nullsoft", "scope": "machine", "url": "https://download-installer.cdn.mozilla.net/pub/firefox/releases/155.0.1/win32/en-US/Firefox%20Setup%20155.0.1.exe", "host": "download-installer.cdn.mozilla.net", "filename": "Firefox Setup 155.0.1.exe", "sha256": "45f93b45121abe514116a2b392b683be83cd65a5d5dc8fdaa549e3d67e6be39c", "product_code": "Mozilla Firefox", "switches": { "silent": "/S /PreventRebootRequired=true", "silent_with_progress": "/S /PreventRebootRequired=true", "install_location": "/InstallDirectoryPath=\"\"" }, "upgrade_behavior": "install", "protocols": [ "http", "https", "mailto" ], "file_extensions": [ "avif", "htm", "html", "pdf", "shtml", "svg", "webp", "xht", "xhtml" ] }, { "platform": "windows", "architecture": "x64", "type": "nullsoft", "scope": "machine", "url": "https://download-installer.cdn.mozilla.net/pub/firefox/releases/155.0.1/win64/en-US/Firefox%20Setup%20155.0.1.exe", "host": "download-installer.cdn.mozilla.net", "filename": "Firefox Setup 155.0.1.exe", "sha256": "27a24fcdde805cb6a34c5c102e98ebfe5f0302078202376d2828f8797ed80298", "product_code": "Mozilla Firefox", "switches": { "silent": "/S /PreventRebootRequired=true", "silent_with_progress": "/S /PreventRebootRequired=true", "install_location": "/InstallDirectoryPath=\"\"" }, "upgrade_behavior": "install", "protocols": [ "http", "https", "mailto" ], "file_extensions": [ "avif", "htm", "html", "pdf", "shtml", "svg", "webp", "xht", "xhtml" ] }, { "platform": "windows", "architecture": "arm64", "type": "nullsoft", "scope": "machine", "url": "https://download-installer.cdn.mozilla.net/pub/firefox/releases/155.0.1/win64-aarch64/en-US/Firefox%20Setup%20155.0.1.exe", "host": "download-installer.cdn.mozilla.net", "filename": "Firefox Setup 155.0.1.exe", "sha256": "920a8ef590280b5c5e82cff413bcb1780ef2d887aa9f54218e735ae0f8cf3a92", "product_code": "Mozilla Firefox", "switches": { "silent": "/S /PreventRebootRequired=true", "silent_with_progress": "/S /PreventRebootRequired=true", "install_location": "/InstallDirectoryPath=\"\"" }, "upgrade_behavior": "install", "protocols": [ "http", "https", "mailto" ], "file_extensions": [ "avif", "htm", "html", "pdf", "shtml", "svg", "webp", "xht", "xhtml" ] } ] }, { "platform": "windows", "version": "155.0", "release_date": "2026-09-01", "release_notes": "Version 155.0, first offered to Release channel users on September 1, 2026\n\nNew\n- Smart Window is now available for all users in the USA, Canada, and France to try out! Additionally, Firefox 155 includes many new enhancements:\n - New personalized resume conversation starters help users quickly return to topics they’ve been working on.\n\n - Assistant now responds much faster with Exa web search source citations to provide accurate, trustworthy web grounding in roughly 1/5 the time.\n\n - Organize Tabs now suggests better groupings of your related tabs and gives each group a clearer, more descriptive name.\n\n This feature is part of a progressive roll out.\n What is a progressive roll out?\n Certain new Firefox features are released gradually. This means some users will see the feature before everyone does. This approach helps to get early feedback to catch bugs and improve behavior quickly, meaning more Firefox users overall have a better experience.\n- Firefox now shows how many trackers it has blocked in the address bar, making built-in privacy protections easier to see while browsing. The count can be hidden in settings without turning off tracker blocking.\n This feature is part of a progressive roll out.\n What is a progressive roll out?\n Certain new Firefox features are released gradually. This means some users will see the feature before everyone does. This approach helps to get early feedback to catch bugs and improve behavior quickly, meaning more Firefox users overall have a better experience.\n- Nintendo Switch Pro and compatible aftermarket controllers now work fully in web games on Windows, with the directional pad and analog sticks correctly mapped.\n- Containers can now be reordered in Settings, and the new order is used wherever containers are listed.\n\n- The Translations feature now supports the following languages:\n - Marathi\n - Urdu\n\nFixed\n- Fixed text disappearing in Microsoft 365 Word Online and other web apps on Linux when typing with certain keyboard layouts.\n- Fixed an unnecessary paste confirmation appearing when using the keyboard shortcut to paste without formatting in Google Docs.\n- Firefox now recovers from the toolbar and tab strip being left unresponsive when the platform fails to end a tab drag session.\n- Fixed text inside buttons not being selectable or copyable, which prevented copying direct messages on X and comments on YouTube.\n- Fixed live audio streams such as internet radio stopping when playing in the background.\n- Fixed the sound indicator disappearing from a tab that was moved to another window, leaving no way to see or mute what was playing.\n- Fixed Firefox preventing Linux systems from going to sleep after a long browsing session.\n- Fixed full screen content being letterboxed on MacBooks with a camera notch, most visibly when watching video.\n- Fixed arrow-key and Page Up/Down scrolling not working on some pages with embedded content from other sites.\n- Fixed characters from some less common scripts appearing as empty boxes on web pages on Windows.\n- Fixed WebCodecs VideoEncoder hanging on macOS when encoding a VideoFrame in NV12 format.\n- Various security fixes.\n\nChanged\n- Firefox now limits CSS to 75 levels of nested blocks and functions, preventing crashes that extremely deep nesting can cause under some circumstances. More deeply nested rules and values no longer parse.\n- Firefox now uses firefox-portal-detection.com instead of detectportal.firefox.com to detect captive portals and check network connectivity, so network allowlists referencing the old domain need updating.\n- Firefox now opens mailto: links only in response to an explicit user action, so pages can no longer launch the default mail client unprompted.\n- PDFs smaller than the paper size can now be enlarged to fill the sheet when printing, by setting the scale above 100%.\n\nEnterprise\n- You can find information about policy updates and enterprise-specific bug fixes in the Firefox for Enterprise 155 Release Notes.\n\nDeveloper\n- The Rules View now offers toggles to emulate the prefers-reduced-motion media feature. Emulation options have also moved into a new panel behind the at-rules (@) button.\n- The Debugger in Developer Tools now has a keyboard shortcut, Ctrl+Alt+B (Cmd+Alt+B on macOS), to enable or disable all breakpoints at once.\n- The JSON Viewer now displays JSON Lines (JSONL/NDJSON) documents, including inline errors for invalid lines.\n- Fixed the Storage panel showing cookies from private windows, containers, and other partitions alongside the inspected page's own cookies.\n- Uncaught non-Error exceptions now list their property names in the Console instead of showing only Object.\n\nWeb Platform\n- The CSS attr() function now supports values of any type, so authors can use attribute values in any property rather than only as strings in the content property.\n- Firefox now supports the progress() CSS function.\n- Firefox now supports the alpha() CSS function. This is a relative color function that can be used to modify just the alpha component of a given color.\n- Firefox now supports the Promise.allKeyed and Promise.allSettledKeyed methods from the await dictionary proposal, which take an object of promises and resolve to an object of results with the same keys.\n- Firefox now supports the WebAssembly Compact Import Section proposal, which can reduce the size of WebAssembly modules with many imports.\n- Firefox now supports the WebAssembly Wide Arithmetic proposal, which adds 128-bit arithmetic instructions for better performance in cryptography and arbitrary-precision math.\n- Firefox now supports QUIC version 2 (RFC 9369) for HTTP/3 connections, and uses it when the server selects it through compatible version negotiation (RFC 9368).\n- Support for the non-standard ::-webkit-scrollbar pseudo-element, added in Firefox 153, is now limited to a small list of sites rather than applying universally.\n- SVG elements now expose the same URL properties as HTML links, including protocol, host, pathname, and search.\n- SVGGraphicsElement.getBBox() now honors its options argument, so bounding boxes can include stroke, markers, and clipping.\n- The font-width property is now supported as the standard name for font-stretch.\n- A dynamic import() that fails due to a network or HTTP error is no longer cached as a failure in the module map, so retrying the same specifier can now succeed.\n- WebTransport now supports send groups (createSendGroup()) for controlling how bandwidth is shared between streams, writable datagram streams (createWritable()), and exportKeyingMaterial() for deriving keys bound to the TLS session. It also adds a draining promise and subprotocol negotiation through the constructor's protocols option and the protocol property.\n- Firefox now supports RTCError for data channel failures, RTCSctpTransport.maxChannels, two-byte RTP header extension IDs, and more accurate RTCTransportStats, improving WebRTC interoperability.\n\nUnresolved\n- For users with vertical tabs enabled, the sidebar may not persist across Firefox restarts. Vertical tabs can be re-enabled after the restart by clicking the sidebar toolbar button. A fix is currently in development. (Bug 2065431)\n- Some sites may load slowly or fail to load on networks that block UDP. This can affect e.g. corporate networks where a proxy or firewall blocks QUIC as part of TLS inspection. To work around it, set network.http.happy_eyeballs_enabled to false with the Preferences policy. A fix is planned for the 155.0.1 release shipping no later than 8-September. (Bug 2063452)\n\nCommunity Contributions\n- With the release of Firefox 155, we are pleased to welcome the developers who contributed their first code change to Firefox in this release, 20 of whom were brand new volunteers! Please join us in thanking each of these diligent and enthusiastic individuals, and take a look at their contributions:\n - Artem Bilous: 2056733\n - Cameron: 2052559, 2052619\n - Colden Cullen: 2060708\n - Dan: 1735300\n - Fede: 1418178, 2040498, 2046774\n - Giulio B: 2048884\n - K: 1642578\n - Kevin Gosse: 2054036\n - Michael F: 2052438\n - mikey gough: 2053551\n - munawiki: 2055309\n - Nathan Leuz: 2053550\n - Nirmal Advani: 1804108, 2003174, 2003177, 2003181, 2031618, 2033570, 2046156, 2052618, 2053543, 2053566, 2053568, 2053977, 2058556, 2059866, 2060649\n - Priyanshu[:0xanshu]: 1977947\n - Richard Van Natta[:rnvannatta]: 2052617\n - Ruhollah Majdoddin: 1856645, 2060029, 2061166, 2061348\n - Shawn Zivontsis: 2025999\n - Simon Rosen: 1875517\n - Yuxiao Zhu: 1861034\n - Zyphrenn: 2033961, 2059969", "release_notes_url": "https://www.firefox.com/en-US/firefox/155.0/releasenotes/", "manifest_version": "1.12.0", "manifest_dir": "manifests/m/Mozilla/Firefox/155.0", "installers": [ { "platform": "windows", "architecture": "x86", "type": "nullsoft", "scope": "machine", "url": "https://download-installer.cdn.mozilla.net/pub/firefox/releases/155.0/win32/en-US/Firefox%20Setup%20155.0.exe", "host": "download-installer.cdn.mozilla.net", "filename": "Firefox Setup 155.0.exe", "sha256": "5ecfbc8aaedb111afb9bde5f2eb361f9283519fc15aa4dc5d6c47dcae834fb6e", "product_code": "Mozilla Firefox", "switches": { "silent": "/S /PreventRebootRequired=true", "silent_with_progress": "/S /PreventRebootRequired=true", "install_location": "/InstallDirectoryPath=\"\"" }, "upgrade_behavior": "install", "protocols": [ "http", "https", "mailto" ], "file_extensions": [ "avif", "htm", "html", "pdf", "shtml", "svg", "webp", "xht", "xhtml" ] }, { "platform": "windows", "architecture": "x64", "type": "nullsoft", "scope": "machine", "url": "https://download-installer.cdn.mozilla.net/pub/firefox/releases/155.0/win64/en-US/Firefox%20Setup%20155.0.exe", "host": "download-installer.cdn.mozilla.net", "filename": "Firefox Setup 155.0.exe", "sha256": "2718d4cc4b2cf089aa8ac370111652bc763838e1d2ed6d635d465fc17ab6327c", "product_code": "Mozilla Firefox", "switches": { "silent": "/S /PreventRebootRequired=true", "silent_with_progress": "/S /PreventRebootRequired=true", "install_location": "/InstallDirectoryPath=\"\"" }, "upgrade_behavior": "install", "protocols": [ "http", "https", "mailto" ], "file_extensions": [ "avif", "htm", "html", "pdf", "shtml", "svg", "webp", "xht", "xhtml" ] }, { "platform": "windows", "architecture": "arm64", "type": "nullsoft", "scope": "machine", "url": "https://download-installer.cdn.mozilla.net/pub/firefox/releases/155.0/win64-aarch64/en-US/Firefox%20Setup%20155.0.exe", "host": "download-installer.cdn.mozilla.net", "filename": "Firefox Setup 155.0.exe", "sha256": "9cca128dc34f476663b3f64e32dcb3dbd2ae36f73e791adabf8a2a01d2608d5f", "product_code": "Mozilla Firefox", "switches": { "silent": "/S /PreventRebootRequired=true", "silent_with_progress": "/S /PreventRebootRequired=true", "install_location": "/InstallDirectoryPath=\"\"" }, "upgrade_behavior": "install", "protocols": [ "http", "https", "mailto" ], "file_extensions": [ "avif", "htm", "html", "pdf", "shtml", "svg", "webp", "xht", "xhtml" ] } ] }, { "platform": "windows", "version": "154.0.1", "release_date": "2026-08-25", "release_notes": "Version 154.0.1, first offered to Release channel users on August 25, 2026\n\nFixed\n- Fixed slower access to saved passwords and unexpected Primary Password prompts caused by recent changes to password storage. (Bug 2064411, Bug 2065593, Bug 2063993)\n- Fixed an issue where addresses were failing to autofill on some sites. (Bug 2065145, Bug 2063599)\n- Fixed Firefox adding a new Start Menu shortcut on Windows every time it started. (Bug 2064652)\n- Fixed an issue where connections to local network devices were failing without a permission prompt on some sites loaded over HTTP. (Bug 2059274)\n- Fixed a crash that could occur when opening intranet sites that are configured to link to files on a local network share. (Bug 2064648)\n- Fixed an issue on Windows where tab titles were cut off at the start when the system font was MS UI Gothic. (Bug 2056856)\n- Reference link to 154.0 release notes.", "release_notes_url": "https://www.firefox.com/en-US/firefox/154.0.1/releasenotes/", "manifest_version": "1.12.0", "manifest_dir": "manifests/m/Mozilla/Firefox/154.0.1", "installers": [ { "platform": "windows", "architecture": "x86", "type": "nullsoft", "scope": "machine", "url": "https://download-installer.cdn.mozilla.net/pub/firefox/releases/154.0.1/win32/en-US/Firefox%20Setup%20154.0.1.exe", "host": "download-installer.cdn.mozilla.net", "filename": "Firefox Setup 154.0.1.exe", "sha256": "221a23c1322bab5b8f3f6b45ef2ae000fd7328b51c653a15cf4ae0449450d89e", "product_code": "Mozilla Firefox", "switches": { "silent": "/S /PreventRebootRequired=true", "silent_with_progress": "/S /PreventRebootRequired=true", "install_location": "/InstallDirectoryPath=\"\"" }, "upgrade_behavior": "install", "protocols": [ "http", "https", "mailto" ], "file_extensions": [ "avif", "htm", "html", "pdf", "shtml", "svg", "webp", "xht", "xhtml" ] }, { "platform": "windows", "architecture": "x64", "type": "nullsoft", "scope": "machine", "url": "https://download-installer.cdn.mozilla.net/pub/firefox/releases/154.0.1/win64/en-US/Firefox%20Setup%20154.0.1.exe", "host": "download-installer.cdn.mozilla.net", "filename": "Firefox Setup 154.0.1.exe", "sha256": "ec27c770aa951b8f11541ce5c4fa2d15ec8d7fe613662505ce9ab00b196a100e", "product_code": "Mozilla Firefox", "switches": { "silent": "/S /PreventRebootRequired=true", "silent_with_progress": "/S /PreventRebootRequired=true", "install_location": "/InstallDirectoryPath=\"\"" }, "upgrade_behavior": "install", "protocols": [ "http", "https", "mailto" ], "file_extensions": [ "avif", "htm", "html", "pdf", "shtml", "svg", "webp", "xht", "xhtml" ] }, { "platform": "windows", "architecture": "arm64", "type": "nullsoft", "scope": "machine", "url": "https://download-installer.cdn.mozilla.net/pub/firefox/releases/154.0.1/win64-aarch64/en-US/Firefox%20Setup%20154.0.1.exe", "host": "download-installer.cdn.mozilla.net", "filename": "Firefox Setup 154.0.1.exe", "sha256": "0cc61da817e3f07d545d2dcc3e5daae8d1f3fab487132f9f2f918ea3bc4a399c", "product_code": "Mozilla Firefox", "switches": { "silent": "/S /PreventRebootRequired=true", "silent_with_progress": "/S /PreventRebootRequired=true", "install_location": "/InstallDirectoryPath=\"\"" }, "upgrade_behavior": "install", "protocols": [ "http", "https", "mailto" ], "file_extensions": [ "avif", "htm", "html", "pdf", "shtml", "svg", "webp", "xht", "xhtml" ] } ] }, { "platform": "windows", "version": "154.0", "release_date": "2026-08-18", "release_notes": "Version 154.0, first offered to Release channel users on August 18, 2026\n\nNew\n- Firefox's Local Network Access protections now extend to WebSocket connections. Websites that try to open a WebSocket to a device on the local network will now ask for permission first.\n- In Smart Window, Firefox can now suggest groups of related tabs and propose a name for each group.\n\n This feature is part of a progressive roll out.\n What is a progressive roll out?\n Certain new Firefox features are released gradually. This means some users will see the feature before everyone does. This approach helps to get early feedback to catch bugs and improve behavior quickly, meaning more Firefox users overall have a better experience.\n- Local Firefox profile backups are now available on macOS in addition to Windows and Linux, and backups can be restored across all three platforms.\n- Sites can now be exempted from having their cookies and site data cleared on shutdown without also being exempted from tracking protection and other cookie restrictions.\n- The full-page Translations feature now translates