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