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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.

71.0a1 Firefox Nightly

September 2, 2019

Version 71.0a1, first offered to Nightly channel users on September 2, 2019

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.


  • Passwords can be imported from Chrome on macOS in addition to existing support for Windows

    Bug 1423714
  • Locale added: Catalan (Valencia) (ca-valencia)

    Bug 1580094
  • Firefox has a new command line parameter, --kiosk, that opens Firefox in fullscreen mode

    Bug 158968


  • Disabled TLS 1.0 and 1.1 by default on the Nightly channel

    Bug 1579270


Web Platform

  • Subgrid greatly enhances the utility and flexibility of grid layouts by allowing the grid of a child to use the tracks defined on the parent. In addition, the DevTools grid inspector has been improved to support subgrid.

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All Firefox Nightly downloads