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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.

113.0a1 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
  • The Awesomebar result menu is now enabled in Firefox Nightly, allowing you to remove history results and dismiss sponsored Firefox Suggest results.

    Bug 1789661
  • 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
  • Starting with Firefox 112, Nightly users on macOS and Linux can now use FIDO2 / WebAuthn authenticators over USB. Some advanced features, such as fully passwordless logins, require a PIN to be set on the authenticator. It is expected to ship to all users in a future release.

    Bug 1814487
  • 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
  • Mac users can now access macOS Services directly from the context menu.

    Bug 660452
  • Websites that use window.print() can now be printed in Firefox for Android.

    Bug 1659818
  • Firefox for Android now supports hardware accelerated AV1 video decoding by default with supported hardware or via fallback to software decoding.

  • Following up on the work already shipped on macOS and Linux in Firefox 110, GPU-accelerated Canvas2D is now enabled by default for Firefox for Android also.

    Bug 1825182
  • On Windows, the elastic overscroll effect is now enabled by default, with two fingers scrolling on touchpad or scrolling on touchscreen, you will see a bouncing animation when scrolling past the edge of a scroll container.

    Bug 1810641
  • AV1 Image Format files containing animations (AVIS) are now supported, improving Firefox' support for AVIF images across the web.

    Bug 1825580


  • Removed the long-deprecated mozRTCPeerConnection, mozRTCIceCandidate, and mozRTCSessionDescription types. Sites should utilize the non-prefixed variants instead.

    Bug 1531812

Web Platform

  • Firefox 113 adds support for a number of WebRTC features for improved interoperability: RTCMediaSourceStats, RTCPeerConnectionState, RTCPeerConnectionStats ("peer-connection" RTCStatsType), RTCRtpSender.setStreams(), and RTCSctpTransport.

    Bug 1510802
  • 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
  • Starting with Firefox 113, Nightly and early beta builds now behave similar to the other browsers when splitting a node (e.g., typing Enter to split a paragraph) and joining two nodes (e.g., typing Backspace at start of a paragraph to join the paragraph and the previous one) when using the built-in editor. When a node is split, the built-in editor creates new node after the original one, i.e., creates the right node. Similarly, when two nodes are joined, the built-in editor deletes the latter node and moves its children to end of the preceding node.

    This new behavior can also be enabled by web apps themselves for all channels with a call of document.execCommand("enableCompatibleJoinSplitDirection", false, "false") (introduced in bug 1810663). This command is available only when designMode is set to "on" or there is at least one editable element which has contenteditable attribute, and the built-in editor has not handled the insertParagraph, delete, or forwardDelete command.

    Bug 1820116
  • Firefox now supports the scripting CSS media query.

    Bug 1166581
  • The forced-color-adjust property is now supported, allowing authors to opt an element out of color changes in Forced Color Mode for improved readability where the automatically-picked contrasting colors are not ideal.

    Bug 1818819
  • 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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