New

• Focus on just one tab in a group without the clutter. Your active tab now stays in view, keeping things tidy even with the group collapsed.

  

• We’re excited to share another tab groups update that addresses a top request from our community! You can now drag a tab into a collapsed group without automatically expanding it. It’s a quick way to stay organized while minimizing visual distractions.

• Profile management, now rolling out gradually to users globally over the next few weeks, helps you protect your privacy and stay focused by separating your online life into distinct profiles for work, school, vacation planning, or whatever you choose. You can name your profiles and customize them with avatars and color themes for easy recognition, then quickly switch between them while keeping bookmarks, tabs, and browsing history completely separate. The new Profiles feature is available for Windows 11, Mac, and Linux users, with Windows 10 support coming soon.

  

  

  This feature is part of a progressive roll out.

  What is a progressive roll out?

  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.

• You can now close a Picture-in-Picture window without pausing the video. Press Shift + Click on the close button or use Shift + Esc to exit while keeping playback uninterrupted.

• Logins stored in the Firefox Password Manager are now encrypted on disk using a modern encryption scheme (AES-256-CBC), replacing the older 3DES-CBC. This change improves local data protection. Logins synced through Firefox Sync remain end-to-end encrypted and already use AES-256-GCM.

• Visual search powered by Google Lens

  With just a right-click on any image, you can now:
  ✨ Find similar products, places, or objects
  ✨ Copy, translate, or search text from images
  ✨ Get inspiration for learning, travel, or shopping

  Look for the new “Search Image with Google Lens” option in your right-click menu (highlighted with a NEW badge at first).
  This is a desktop-only feature, rolling out worldwide. Your default search engine must be set to Google in order to use it.

  

  

  This feature is part of a progressive roll out.

  What is a progressive roll out?

  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.

• Perplexity AI Search in Firefox

  On desktop, Firefox now includes Perplexity, an AI-powered answer engine built into the browser. Perplexity delivers direct, conversational answers to complex questions, helping you get quick summaries, accurate references, or creative inspiration without digging through multiple sources. It’s rolling out worldwide from the address bar via the unified search button.

  

  This feature is part of a progressive roll out.

  What is a progressive roll out?

  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.

• The following languages are now available for translation:

  • Azerbaijani
  • Bangla
  • Icelandic

Fixed

• Various security fixes.

• The following languages have improved translation quality:

  • Arabic
  • Bulgarian
  • Catalan
  • Chinese (Simplified)
  • Czech
  • Dutch
  • Estonian
  • Finnish
  • French
  • German
  • Hungarian
  • Italian
  • Japanese
  • Portuguese
  • Persian
  • Spanish
  • Ukrainian

Changed

• On Windows, when opening a link from another application, Firefox will only use a window on the current virtual desktop or open a new window if needed.

Enterprise

• You can find information about policy updates and enterprise specific bug fixes in the Firefox for Enterprise 144 Release Notes.

Developer

• Developer Information

• You can now jump to a CSS custom property's definition from within the var() function in style rules.

• The events tooltip in the Inspector now shows a badge besides custom events, making it easier to differentiate them from built-in events.

Web Platform

• Firefox now supports the Element.moveBefore API.

• Firefox now supports math-shift compact.

• Firefox now supports PerformanceEventTiming.interactionId, allowing developers to group related input events. This enables support for the Interaction to Next Paint (INP) responsiveness metric.

• Firefox now supports the command and commandfor attributes.

• Firefox now supports the View Transitions API Level 1. The View Transitions API provides a mechanism for easily creating animated transitions between different website views.

• Dithering is now applied when linear-gradient, conic-gradient, and radial-gradient are rendered using hardware WebRender.

• Firefox now supports the upsert proposal. This adds getOrInsert and getOrInsertComputed methods to Map and WeakMap. These methods either return the value associated with a key, or insert a default value, and then return that value, simplifying handling of cases where it's not known if a key is already present in the Map or WeakMap.

• Firefox now supports the lock() and unlock() methods of ScreenOrientation interface on Windows tablets and Android devices.

• Firefox now supports worker transfer for RTCDataChannel.

• Firefox now supports the resizeMode getUserMedia constraint, allowing developers to crop and downscale video captured from a camera to any resolution they choose.

• Firefox now supports the WebGPU GPUDevice.importExternalTexture API on Windows.

• WebCodecs on Windows now has a batch-encoding path for VideoEncoder, improving performance with higher throughput and lower submission latency due to a larger default batch size.

• Gecko-specific CSS2Properties was renamed to CSSStyleProperties, to align with the latest web standard and for better interoperability with other browser engines.

Community Contributions

• With the release of Firefox 144, 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:

  • Alice Boxhall: 1981341
  • David [:david-loe]: 1726108
  • Diogo Sousa: 1987258
  • fdangers: 1975105
  • jocelyne.ah1: 1980995
  • Josh Berry: 1984553
  • Martin Bruse: 1987128
  • Mountain Dude: 1984695
  • parisoplop: 1984782
  • Riz: 1280266
  • s175911: 1985163

Fixed

• Adjusted the timing of the new drag-to-pin interaction cue for better reliability. (Bug 1989344)

• Fixed an issue that prevented some extensions from updating via the Add-ons Manager. (Bug 1984724)

• Fixed a regression that prevented Firefox View sections from collapsing/expanding as expected. (Bug 1989200)

• Addressed a WebExtensions storage issue that could cause Firefox to crash on startup with certain extensions installed. (Bug 1989840)

• Fixed an issue where opening an add-on's "Extension settings" from the post-install prompt could break the Customize tab and some keyboard shortcuts until restart. (Bug 1983869)

• Reduced long delays when loading certain websites while connected to networks that block UDP connections. (Bug 1980812)

• Various stability and security fixes.

• Reference link to 143.0.1 release notes.

Fixed

• Fixed a tab crash experienced by some users caused by DLL injection. (Bug 1872261)

• Reference link to 143.0 release notes.

New

• On Windows, Firefox now supports running websites as web apps pinned directly to the taskbar. These are sites that you can pin and run as simplified windows directly from the taskbar without losing access to your installed add-ons. This feature is not currently available for Firefox installs from the Microsoft Store.

• Tabs can now be pinned by dragging them to the start of the tab strip, making it easier to keep important sites within reach.

  

• Copilot from Microsoft can now be chosen as a chatbot to use in the sidebar for quick access without leaving your main view.

• When a site asks for camera access, it can now be previewed inside the permission dialog. This is especially helpful when switching between multiple cameras.

  

• The Firefox address bar can now show you important dates and events. This feature supports displaying events (e.g. “Mother’s Day”) in the United States, United Kingdom, Germany, France, and Italy regions.

• Firefox has expanded its Fingerprinting Protection by reporting constant values for several more attributes of user's computers.

• When downloading a file in Private Browsing mode, Firefox now asks whether to keep or delete it after that session ends. You can adjust this behavior in Settings.

  
  

• Firefox now supports Windows UI Automation, which improves support for accessibility tools such as Windows Voice Access, Text Cursor Indicator and Narrator.

  

  This feature is part of a progressive roll out.

  What is a progressive roll out?

  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.

Fixed

• Various security fixes.

Enterprise

• You can find information about policy updates and enterprise specific bug fixes in the Firefox for Enterprise 143 Release Notes.

Developer

• Developer Information

• Unchecking the Group Similar Messages setting now prevents successive similar messages from being grouped so that all messages are displayed in the output.

• Switching between unmodified and pretty printed sources in the debugger no longer opens a new tab for pretty printed content.

• When the Inspector is focused, the eyedropper can now be launched to pick a color via the Ctrl+Shift+Y keyboard shortcut.

Web Platform

• Firefox now supports xHE-AAC audio playback on Windows 11 22H2+, macOS, and Android 9+.

• Firefox now uses an updated grid sizing algorithm to better align with the CSS Grid specification. Grid layouts that use percentage row sizes or grid items containing elements with aspect ratios (such as images) will now render correctly in more cases.

• <input type=color> now recognizes the CSS <color> format in addition to the color hex format (#ffffff). This means that color names like black and more complex strings like rgb(200 200 200) are now valid inputs. For now the value will always be converted to the hex format.

• Restrictions were removed that prevented setting the display property on <details> elements, and a ::details-content pseudo-element was added to style the expandable/collapsible contents of those elements.

Community Contributions

• With the release of Firefox 143, 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:

  • AnonAlly: 1978245
  • Balraj Dhawan: 1977903
  • Damia Vergnet: 1932365, 1979629
  • Gaétan Fine: 1177108
  • jonas.muecke: 1978226
  • Markus Probst: 1976974
  • Mason Abbruzzese: 1957214
  • Mauro V [:cheff]: 1507381, 1849937, 1872780, 1938638, 1943057, 1975093, 1976968
  • Nicolas Auvray [:Itms]: 1982134
  • overflowcat: 1978108
  • Robert: 1980791
  • s1m: 1964526

Fixed

• Dragging multiple non-adjacent tabs in horizontal tab strip mode now correctly moves them together as a group. (Bug 1982933)

• Dragging multiple tabs no longer causes toolbar unresponsiveness or visual glitches. (Bug 1984342)

• Fixed an issue where the text cursor appeared in the wrong location.. (Bug 1984045)

• Fixed a crash related to gamepad use, particularly on macOS. (Bug 1870379)

• Fixed an issue where the expand on hover feature in the sidebar would sometimes stop working. (Bug 1982129)

• Fixed a crash in KDE Plasma when using certain custom window decorations. (Bug 1984823)

• Reference link to 142.0 release notes.

New

• For users in the United States, article recommendations on your New Tab page are now grouped into topic sections like Sports, Food, and Entertainment to make stories more organized and easier to scan. You can also follow topics you’re interested in and block ones you’d prefer not to see, giving you more control over what shows up when you open a new tab.

  

  This feature is part of a progressive roll out.

  What is a progressive roll out?

  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.

• You can now see what’s behind a link before visiting it with Link Previews. Long press a link (or right-click and choose Preview Link). Previews can optionally include AI-generated key points, which are processed on your device to protect your privacy.

  Link Previews is gradually rolling out to ensure performance and quality and is now available in en-US, en-CA, en-GB, en-AU for users with more than 3 GB of available RAM.

  

  This feature is part of a progressive roll out.

  What is a progressive roll out?

  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.

• On Windows, clicking a persistent notification when Firefox is closed or restarted will now properly open Firefox with the relevant webpage, instead of just opening the main page of the website.

• ETP Strict mode now supports a flexible exception list to fix broken site features caused by tracker blocking. Exceptions are split into baseline (core functionality) and convenience (extra features), letting users choose improved site compatibility without compromising key privacy protections.

• Keep an active tab visible in a collapsed tab group
  Focus on just one tab in a group without the clutter. Your active tab stays in view, keeping things tidy even with the group collapsed.

• You can now remove extensions from the sidebar by right-clicking the extension icon and selecting Remove from Sidebar.

Fixed

• Improved the scroll speed in the bookmarks dialog to not go beyond the component area.

• Improved drag-and-drop support for blob images.

• Various security fixes.

Changed

• Improved search results from browsing history via the address bar, reducing the likelihood of duplicate results being shown.

• Improved Netmonitor so that Request Headers/Cookies/Params are displayed in the Network panel even if the request isn't finished yet.

Enterprise

• You can find information about policy updates and enterprise-specific bug fixes in the Firefox for Enterprise 142 Release Notes.

Developer

• Developer Information

• Firefox now supports the wllama API for extensions, enabling developers to integrate local language model (LLM) capabilities directly into their add-ons.

• The Debugger now offers a new setting to control whether the debugger overlay is shown during paused script execution.

  

• Firefox now supports the Prioritized Task Scheduling API, enabling developers to assign and manage task priorities.

• The Selection.getComposedRanges() API is now available, allowing developers to accurately get selected text ranges across shadow DOM boundaries.

• Added support for the URLPattern API, enabling developers to match and parse URLs using a standardized pattern syntax.

Unresolved

• Multiselecting non-contiguous tabs to drag may result in toolbar unresponsiveness or visual glitches. Dragging any single tab should resolve this. We will be landing a fix in the next dot release with Bug 1984342.

Community Contributions

• With the release of Firefox 142, 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:

  • Alex Stout: 1845523
  • Ayush Kaintura: 1963306
  • Beatriz Rizental: 1971306, 1972755
  • biyul.dev: 1931528, 1975074, 1976504
  • celenity: 1977078
  • chase.philpot: 1973697
  • Clément Brisset: 1969603
  • Connor Sabine: 1975559
  • eri: 1958853
  • Ernest Molner: 1968300
  • Jacqueline Amherst: 1961204
  • jesper: 1974023
  • Jim Gong: 1975871
  • JP Belval: 1961487
  • jtech3029: 1951724
  • Nate Gross: 1957261, 1968719
  • Richard LoRicco: 1975300
  • Rong Bao [:csmantle]: 1975201, 1975350, 1975439, 1975492, 1975643, 1975645, 1975720, 1975752, 1975849, 1975983, 1976155, 1976157, 1976225, 1976389, 1976397, 1976410, 1976699, 1976799
  • shwetank.tewari.87: 1831397
  • William: 1960743

New

• Now Firefox can help you keep your tabs organized, automatically. A local AI model identifies similar tabs, automatically organizes them into groups, and even suggests group names. Everything happens on your device to respect your privacy. Learn more here.

  

  

  This feature is part of a progressive roll out.

  What is a progressive roll out?

  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.

• Vertical tabs users can now adjust the size of the tools areas at the bottom of the sidebar. To see fewer tools and more tabs, drag down the divider line which pushes extra tools into an overflow menu.

  

• On Linux, Firefox uses less memory and no longer requires a forced restart after an update has been applied by a package manager.

• Address autofill has been enabled for users in Brazil, Spain and Japan.

• The Firefox address bar can now be used as a unit converter. The unit converter supports converting units of length, temperature, mass, force, and angular measurement, as well as timezones (e.g. “now in GMT” , “10am EDT to CET”). Selecting the result will copy it to your clipboard. Learn more here.

  

• Firefox builds in Valencian now come with a built-in Catalan (Valencian variant) dictionary for the Firefox spellchecker.

• The following languages are now available for translation:

  • Albanian
  • Gujarati
  • Hebrew
  • Hindi
  • Kannada
  • Malay
  • Malayalam
  • Persian
  • Telugu

Fixed

• Various security fixes.

Changed

• Firefox on Windows 11 now uses system provided font icons for the caption buttons, more in line with Windows 11 conventions.

Enterprise

• You can find information about policy updates and enterprise specific bug fixes in the Firefox for Enterprise 141 Release Notes.

Developer

• Developer Information

• Firefox will now also clear the back-forward-cache when receiving the Clear-Site-Data: "cache" response header.

• When creating a logpoint in the Debugger, there's now a checkbox allowing to output the stacktrace in addition to the log message in the Console.

Web Platform

• Enabled the WebGPU API (spec; MDN) on Windows. For details, see the Mozilla Graphics Team Blog.

• Implemented the closedby attribute and it's related closedBy property on dialogs indicating the types of user actions that can be used to close the associated <dialog> element.

• Support for Cookies Having Independent Partitioned State (CHIPS) is now re-enabled, allowing developers to opt a cookie into storage partitioning per top-level site.

• The HTMLElement.showPopover() and HTMLElement.togglePopover() methods now take an options.source argument referencing the popover invoker, and togglePopover() also takes a force resp. options.force argument to force the popover open or closed.

Community Contributions

• With the release of Firefox 141, 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:

  • ales.astone: 1920385, 1968910
  • Chris Vander Linden: 1888847
  • Gabriel Astorgano[:astor}: 1911190
  • Jelte Fennema: 1945951
  • Mr. Beedell, Roke Julian Lockhart (RJLB): 1969599
  • Nick Crast: 1965895
  • Sajid Anwar [:sajidanwar]: 825197, 1969770
  • Simon Wülker: 1971080
  • Skye Green [:skyevg]: 1965646
  • viet-hung.nhu: 1968288
  • wilsu: 1956211
  • наб: 1970690

Fixed

• Fixed a startup crash experienced by some Linux users with outdated NVIDIA drivers. (Bug 1978911)

• Fixed a regression that caused canvas objects to be draggable, causing web compatibility issues. (Bug 1978673)

• Fixed a crash in the Web Developer Tools panel that could occur when inspecting pages with <iframe> elements. (Bug 1975277)

• Fixed minor visual issues across the user interface. (Bug 1974269 · Bug 1976031 · Bug 1974876 · Bug 1976701)

• Firefox wouldn't start on some systems where GTK+ was built without Wayland support. (Bug 1978620)

• Fixed an issue where clicking a pinned tab could steal focus from the content area, disrupting keyboard navigation. (Bug 1977005)

• Reference link to 141.0 release notes.

Fixed

• Fixed a regression that caused issues on sites built with the Svelte framework. (Bug 1980081)

• Fixed an issue where cryptominers were not listed as blocked in Strict Tracking Protection. (Bug 1977066)

• Reference link to 141.0.2 release notes.

Fixed

• Fixed a regression that caused issues on sites built with the Svelte framework. (Bug 1980081)

• Fixed an issue where cryptominers were not listed as blocked in Strict Tracking Protection. (Bug 1977066)

• Reference link to 141.0.2 release notes.

Fixed

• Fixed a startup crash experienced by some Linux users with outdated NVIDIA drivers. (Bug 1978911)

• Fixed a regression that caused canvas objects to be draggable, causing web compatibility issues. (Bug 1978673)

• Fixed a crash in the Web Developer Tools panel that could occur when inspecting pages with <iframe> elements. (Bug 1975277)

• Fixed minor visual issues across the user interface. (Bug 1974269 · Bug 1976031 · Bug 1974876 · Bug 1976701)

• Firefox wouldn't start on some systems where GTK+ was built without Wayland support. (Bug 1978620)

• Fixed an issue where clicking a pinned tab could steal focus from the content area, disrupting keyboard navigation. (Bug 1977005)

• Reference link to 141.0 release notes.