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See what landed recently in Firefox Nightly!

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.

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Firefox Nightly is no longer supported on Windows 8.1 and below.

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125.0a1 Firefox Nightly

February 19, 2024

Version 125.0a1, first offered to Nightly channel users on February 19, 2024

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 @FirefoxNightly@mozilla.social 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 chat.mozilla.org.

New

  • Starting with Firefox 124, Firefox now prompts nightly users in the US and Canada to save their addresses upon submitting an address form, allowing Firefox to autofill stored address information in the future.

    Bug 1875253
  • Starting with Firefox 124, nightly users can now search in the Address Bar for tabs open in different containers. This behavior can be controlled through the browser.urlbar.switchTabs.searchAllContainers boolean preference.

    Bug 1876743
  • Starting with Firefox 124, a simpler and more unified dialog for clearing user data is now available. In addition to streamlining data categories, the new dialog also provides insights into the site data size corresponding to the selected time range.

    Bug 1874702

Web Platform

  • Starting with Firefox 122, the popover attribute is now supported by default in Nightly builds. The popover global attribute is used to designate an element as a popover element. The element won't render until it becomes shown, it will then render on top of other page content.

    Bug 1866666
  • Support for SVGAElement.text was removed in favor of the more widely-implemented SVGAElement.textContent method.

    Bug 1880689

Get the most recent version

Your system may not meet the requirements for Firefox, but you can try one of these versions:

Firefox Nightly is no longer supported on Windows 8.1 and below.

Please download Firefox ESR (Extended Support Release) to use Firefox.

Firefox Nightly is no longer supported on macOS 10.14 and below.

Please download Firefox ESR (Extended Support Release) to use Firefox.

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All Firefox Nightly downloads