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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.

155.0.1 Firefox Release

September 4, 2026

Version 155.0.1, first offered to Release channel users on September 4, 2026

Fixed

  • Fixed Firefox becoming unresponsive on some pages that use CSS blur and backdrop filters together. (Bug 2068836)

  • Fixed the sidebar not reappearing after restarting Firefox when the "Hide tabs and sidebar" option was turned on. (Bug 2065431)

  • Fixed some profile icons not being displayed in the account and application menus. (Bug 2064729, Bug 2067734)

  • Fixed the current device being listed among connected devices in the account menu. (Bug 2059763)

Unresolved

  • Standard dynamic range (SDR) video in some formats can appear washed out on macOS. The issue is under investigation and a fix will ship in a future release. (Bug 2068961)

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