Firefox Beta and Developer Edition
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.

137.0beta Firefox Beta

March 4, 2025

Version 137.0beta, first offered to Beta channel users on March 4, 2025

Firefox Beta gets updated 3 times a week and as a consequence, the release notes for the Beta channel are updated continuously to reflect features that have reached sufficient maturity to benefit from community feedback and bug reports.

Warning: Features listed here may or may not make a final release of Firefox.

In addition to these release notes, you can follow ongoing development via the Firefox Trains website or our @FirefoxBeta Bluesky account.

New

  • Firefox now identifies all links in PDFs and turns them into hyperlinks.

  • Support HEVC playback on Linux.

Changed

  • Due to recent changes in MacOS Sequoia, the shortcut to complete search strings to .com addresses has been changed on MacOS from Ctrl+Enter to Cmd+Enter. The preference to disable this feature, browser.urlbar.ctrlCanonizesURLs, was not renamed, and it's valid across all the supported platforms.

Developer

  • Developer Information

  • In the Inspector Fonts panel, we now display fonts metadata, like the the font version, designer, vendor, license…

    Screenshot of the fonts panel with vendor metadata displayed

  • The Network panel now allows overriding network request responses with local files.

    Screenshot of the context menu in the Network panel with the new Set Network Override option

Web Platform

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All Firefox Beta downloads