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.

Firefox Nightly

March 13, 2023

Version 113.0a1, first offered to Nightly channel users on March 13, 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 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


  • Say hello to enhanced Picture-in-Picture! Rewind, check video duration, and effortlessly switch to full-screen mode on the web's most popular video websites.

    Bug 1778801
  • Passwords generated in Firefox now include special characters, making them more secure.

    Bug 1559986
  • Importing bookmarks from Safari or a Chrome-based browser? The favicons for those bookmarks will now also be imported by default to make them easier to identify.

    Bug 326701
  • The Windows GPU sandbox first shipped in the Firefox 110 release has been tightened to enhance the security benefits it provides

    Bug 1822308
  • A 13-year-old feature request was fulfilled, and Firefox now supports files being drag-and-dropped directly from Microsoft Outlook. A special thanks to volunteer contributor Marco Spiess for helping to get this across the finish line!

    Bug 580928

Web Platform

  • Module scripts can now import other ES module scripts on worklets.

    Bug 1572644
  • Firefox now supports the color functions from the color (level 4) specification. This includes the lab(), lch(), oklab(), oklch() and color() functions.

    Bug 1352753
All Firefox Nightly downloads