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Firefox Release Notes

Release Notes tell you what’s new in Firefox. As always, we welcome your feedback. You can also file a bug in Bugzilla or see the system requirements of this release.

124.0 Firefox Release

March 19, 2024

Version 124.0, first offered to Release channel users on March 19, 2024


  • Caret browsing mode now also works in the PDF viewer. (Learn more)

  • In Firefox View, open tabs can now be sorted by either recent activity or tab order. Recent activity is the default setting.

  • Firefox now populates the Windows taskbar jump list more efficiently, which should allow for a smoother overall browsing experience.

  • Firefox on Mac now uses the macOS fullscreen API for all types of fullscreen windows. This should better match the expected macOS user experience for fullscreen spaces, menubar and the Dock.

  • As of Firefox 124, Qwant's availability has been expanded to all languages in the France region along with Belgium, Italy, Netherlands, Spain, and Switzerland.



Web Platform

  • Added support for AbortSignal.any.

  • You can now use HTTP(S) and relative URLs when creating WebSockets.

Community Contributions

  • With the release of Firefox 124, 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:

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