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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.

118.0a1 Firefox Nightly

August 1, 2023

Version 118.0a1, first offered to Nightly channel users on August 1, 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
  • 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
  • Starting with Firefox 117, Nightly builds now support adding images when editing PDFs in addition to adding text and drawing.

    Bug 1843054
  • On Firefox for Android, printing page content from the browser or share menu is now available.

    Bug 1840471
  • On Firefox for Android, pinned user shortcuts now open in an existing tab if it already has the same URL.

    Bug 1840721
  • Web Audio in Firefox now uses the FDLIBM math library on all systems to improve anonymity with Fingerprint Protection.

    Bug 1358149
  • Starting with Firefox 118, Nightly now supports UI setting that enables the user to opt-in into GPC, a privacy signal that tells the websites that the user doesn’t want to be tracked and doesn’t want their data to be sold.

    Bug 1830623
  • The visibility of fonts to websites has been restricted to system fonts and language pack fonts to mitigate font fingerprinting in Private Browsing windows.

    Bug 1849903


  • On Firefox for Android, the clearing of site data was moved from "Browsing history and site data" to the "Cookies and site data" menu item.

    Bug 1813788


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
  • 10 new CSS math functions are now supported: round, mod, rem, pow, sqrt, hypot, log, exp, abs, sign.

    Bug 1814589

Get the most recent version

All Firefox Nightly downloads