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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.

116.0a1 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 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
  • Sidebar switcher allows users to access Bookmarks, History and Synced Tabs panels easily, quickly switch between them, move the sidebar to another side of the browser window, or close the sidebar. Now, keyboard users would be able to do it all with ease too, with or without any assistive technology running, without needing to memorize keyboard shortcuts to access these panels.

    Bug 1532282
  • When an update is available in English locales, users will now have access to the release notes in the update notification prompt in the form of a "Learn More" link.

    Bug 1831906
  • It is now possible to copy any file from your operating system and paste it into Firefox.

    Bug 1699743
  • You asked, and we listened! The volume slider is now available in Picture-in-Picture.

    Bug 1580095
  • We added the possibility to edit existing text annotations in the PDF reader.

    Bug 1838799
  • Starting with Firefox 115, Nightly supports a new “Copy Link Without Site Tracking” context menu action which prevents disclosure of identifying or sensitive information by removing superfluous query and tracking parameters from the copied links.

    Bug 1823332


Web Platform

  • This release now supports proper BYOB readers on Fetch and WebTransport, which allows developers to prepare their ArrayBuffer so that it can be reused for read requests and thus saves memory allocation. .getReader({ mode: "byob" }) on Fetch and WebTransport streams was supported on previous releases but without true BYOB support, as new memory allocation still occurred internally.

    Bug 1811440

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