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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.

143.0.3 Firefox Release

September 30, 2025

Version 143.0.3, first offered to Release channel users on September 30, 2025

Fixed

  • Adjusted the timing of the new drag-to-pin interaction cue for better reliability. (Bug 1989344)

  • Fixed an issue that prevented some extensions from updating via the Add-ons Manager. (Bug 1984724)

  • Fixed a regression that prevented Firefox View sections from collapsing/expanding as expected. (Bug 1989200)

  • Addressed a WebExtensions storage issue that could cause Firefox to crash on startup with certain extensions installed. (Bug 1989840)

  • Fixed an issue where opening an add-on's "Extension settings" from the post-install prompt could break the Customize tab and some keyboard shortcuts until restart. (Bug 1983869)

  • Reduced long delays when loading certain websites while connected to networks that block UDP connections. (Bug 1980812)

  • Various stability and security fixes.

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