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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.

117.0a1 Firefox Nightly

July 4, 2023

Version 117.0a1, first offered to Nightly channel users on July 4, 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 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
  • Firefox has added a new dom.event.contextmenu.shift_suppresses_event preference allowing users to disable Firefox forcing the context menu to appear when pressing shift+right-click on a webpage as it can sometimes cause undesirable outcomes on certain sites.

    Bug 1759303
  • macOS users can now control the tabability of controls and links via about:preferences

    Bug 1628476
  • Starting with Firefox 117, recently closed tabs now persist between sessions for Nightly users that don't have automatic session restore enabled. Manually restoring a previous session will continue to reopen any previously open tabs or windows.

    Bug 1820660
  • Firefox for Android now supports pasting images into contenteditable & designMode elements. Previously, only plain text and HTML was supported.

    Bug 1839582
  • Starting with Firefox 117, Nightly builds now include extended region support for credit card autofill for the AT, BE, ES, IT, and PL locales.

  • Starting with Firefox 117, Nightly builds now support adding images when editing PDFs in addition to adding text and drawing.

    Bug 1843054
  • Automated translation of web content is now available to Firefox users! Unlike cloud-based alternatives, translation is done locally in Firefox, so that the text being translated does not leave your machine.

    Bug 1831963


  • Firefox does not show a screen sharing indicator on Wayland any more. It never worked as well as on other platforms and desktop environments typically provide sharing indicators already.

    Bug 1668358


  • Starting with Firefox 116, we are enabling for nightly users a prototype Federated Credential Management implementation, a Web Platform API that allows users to login to websites with their federated accounts in a privacy preserving manner.

    Bug 1803629
  • Web compatibility inspection has been enhanced with our new CSS compatibility tooltip in the Developer Tools Inspector. An icon is now displayed next to properties that could lead to web compatibility issues. When hovered, the tooltip indicates which browsers are not supported and displays a link to the MDN page for the property so the user can learn more about it.

    Bug 1840775

Web Platform

  • Starting with Firefox 117, partial support for the custom highlight API is now available in Nightly builds, allowing web developers to give ranges an appearance.

    Bug 1840818
  • ReadableStream.from is now supported, allowing creation of a ReadableStream from an (async) iterable.

    Bug 1772772
  • Support for improved CSS nesting is now enabled by default.

    Bug 1840781
  • Firefox now supports RTCRtpScriptTransform

    Bug 1631263
  • Firefox now supports the CSS properties math-style and math-depth and the font-size: math value.

    Bug 1845516

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All Firefox Nightly downloads