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

June 5, 2023

Version 116.0a1, first offered to Nightly channel users on June 5, 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 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


  • Starting with Firefox 115, Nightly users without platform support for H264 video decoding can now fallback to Cisco's OpenH264 plugin for playback.

    Bug 1832568
  • Starting with Firefox 115, Nightly and early beta users can access automated translation of web content in Firefox. Unlike cloud-based alternatives, translation is done locally in Firefox, so that the text being translated does not leave your machine.

    Bug 1831963

Web Platform

  • Starting with Firefox 113, the WebTransport API is now enabled in the Nightly channel, including RFC 9297 support. It's expected to ship to release in the near future. WebTransport is expected to see widespread use for media delivery and other applications. WebTransport is built on top of QUIC/HTTP3 and provides reliable streams and reliable and unreliable datagrams.

    Bug 1818754
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