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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.

Firefox Nightly — English (US)

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Firefox Nightly — English (US)

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

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160.0a1 Firefox Nightly

Version 160.0a1, first offered to Nightly channel users on October 8, 2026

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 Bluesky account, our @FirefoxNightly 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.

Starting with Firefox 159, Firefox Nightly on Android automatically turns on DNS over HTTPS for users in the United States, as Firefox on desktop does, unless network checks indicate it should stay off.
Bug 2073500

Starting with Firefox 159, Firefox Nightly on macOS selects the word or link under the pointer when right-clicking like other macOS apps.
Bug 1751335

Developer Information

Starting with Firefox 158, Firefox Nightly supports the corner-shape property, including all corner-*-shape longhand properties, allowing to change the shape of the corners of an element.
Bug 2070927
Starting with Firefox 158, Firefox Nightly now supports the random() CSS function, which allows authors to introduce randomness into their styles, generating a random value in a given range (with an optional increment) that is usable anywhere that math functions can be specified.
Bug 2071165
Starting with Firefox 158, Firefox Nightly now supports streaming uploads with the Fetch API, allowing web applications to send request bodies incrementally using a ReadableStream without buffering the entire body first.
Bug 1594633

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Firefox Nightly — English (US)

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See what landed recently in Firefox Nightly!

160.0a1 Firefox Nightly

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