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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.

89.0a1 Firefox Nightly

March 22, 2021

Version 89.0a1, first offered to Nightly channel users on March 22, 2021

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.


  • We keep on working on improving our PDF forms support and now support JavaScript embedded in PDF files (some PDF forms use JavaScript for validation and other interactive features). If you find any bug with this feature, please file an issue on the PDF.js repository

  • We’ve added a new locale on Nightly: Tajik (tg).


  • Colors in Firefox on macOS will no longer be saturated on wide gamut displays, untagged images are properly treated as sRGB, and colors in images tagged as sRGB will now match CSS colors.

    Bug 1696688


  • Introducing a non-native implementation of web form controls, which delivers a new modern design and some improvements to page load performance. Watch for layout bugs in web pages that make assumptions about the dimensions or styling of form controls.

    Bug 1697053

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