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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.

74.0a1 Firefox Nightly

January 6, 2020

Version 74.0a1, first offered to Nightly channel users on January 6, 2020

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.


  • Firefox users can now import profile data from Edgium on Windows and Mac

    Bug 1605491
  • A New Container Tab menu can now be opened with right click on the new tab button. In addition, an option to require a container tab to be selected when the new tab button is clicked is available.

    Bug 1606265



  • The OS compositor has been enabled for macOS when WebRender is enabled

    Bug 1592016
  • On Windows, Ctrl+I can now be used to open the Page Info window instead of opening the Bookmarks sidebar. Ctrl+B still opens the Bookmarks sidebar.

  • DNS over HTTPS (with Cloudflare as the DNS resolver) will be rolled out for users, turning the option on by default for users in the United States. For an alternate DNS service, users can select NextDNS via the Network Settings dialog in Preferences.


  • Service Workers and Web App Manifests are easier to inspect in the Developer Tools new Application panel, which also integrates into the newly landed Service Worker debugging capabilities.

    Bug 1609356

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