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Firefox Nightly
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.

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Firefox Nightly is no longer supported on Windows 8.1 and below.

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126.0a1 Firefox Nightly

March 18, 2024

Version 126.0a1, first offered to Nightly channel users on March 18, 2024

Firefox Nightly gets updated every day and as a consequence, the release notes for the Nightly 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 on our @FirefoxNightly Twitter account, our @FirefoxNightly@mozilla.social Mastodon account as well as read our Nightly Blog.

You can interact with other Firefox Nightly users and give your feedback to Mozilla staff in the Nightly Matrix room on chat.mozilla.org.

New

  • Starting with Firefox 124, a simpler and more unified dialog for clearing user data is now available in Nightly builds. In addition to streamlining data categories, the new dialog also provides insights into the site data size corresponding to the selected time range.

    Bug 1874702
  • Starting with Firefox 125, Nightly builds support resolving HTTPS DNS records with the operating system's DNS resolver on specific platforms (Windows 11, Linux, Android 10+) without requiring DNS over HTTPS to be enabled. This capability allows the use of HTTP/3 without needing to use the Alt-Svc header, upgrades requests to HTTPS when the DNS record is present, and enables wider use of ECH. This feature is expected to ship in Firefox 126.

    Bug 1874464
  • A simpler and more unified dialog for clearing user data is now available.
    In addition to streamlining data categories, the new dialog also provides insights into the site data size corresponding to the selected time range.

    Bug 1883764
  • Enabled AV1 hardware decode acceleration on macOS for M3 Macs.

    Bug 1871796

Fixed

  • Fix for MFSA 2024-15 included in 2024-03-21 builds and newer.

Changed

  • For consistency with Firefox Desktop and addons.mozilla.org, Firefox for Android's "add-ons" settings have been renamed to "Extensions".

    Bug 1885561

Developer

Web Platform

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Please download Firefox ESR (Extended Support Release) to use Firefox.

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All Firefox Nightly downloads