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See what landed recently in Firefox Nightly!

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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122.0a1
Firefox Nightly

November 20, 2023

Version 122.0a1, first offered to Nightly channel users on November 20, 2023

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 122, the URL Paste Suggestion feature is now enabled by default in Nightly builds. This enhancement provides a convenient way for users to quickly visit URLs copied to the clipboard in the address bar of desktop Firefox. When the clipboard contains a URL, and the user focuses on the URL bar, an autocomplete result appears automatically. Activating the clipboard suggestion will navigate the user to the URL with 1 click.

    Bug 1860548

Web Platform

  • Starting with Firefox 120, ULPFE/RED is now on by default for video in Nightly builds. This provides additional protection against packet loss for video during WebRTC calls.

    Bug 1852837
  • Firefox now supports animating the SVG viewBox attribute using SMIL by animations. by animations are animations that are relative to the original value. Other attributes such as lengths and angles already support by, but a viewBox consists of four separate values.

    Bug 1865470
  • The LargestContentfulPaint API has been added, this provides timing information about the largest image or text paint before users interact with a web page.

    Bug 1866266

Get the most recent version

Your system may not meet the requirements for Firefox, but you can try one of these versions:

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

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

Firefox Nightly is no longer supported on macOS 10.14 and below.

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

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All Firefox Nightly downloads