Firefox 146 release notes for enterprise admins

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Firefox 146

Released 9 December 2025.

These changes apply to Firefox 146 and Firefox ESR 140.6.0 unless explicitly stated.

New in Firefox 146

• BrowserDataBackup: Disable backup or restore of profile data. Does not apply to the ESR.

Changes

• The version number, architecture and language were removed from the Windows uninstall registry key, improving compatibility with third-party tools. Does not apply to the ESR. (bug 1995769)
• Firefox Labs can now be enabled regardless of the status of DisableTelemetry or DisableFirefoxStudies. Does not apply to the ESR. (bug 1972647)

Fixes

• Private Window options were still available when private browsing was disabled. (bug 2001191)
• DisableProfileImport: Data could still be imported in Firefox View when the policy was set. (bug 1993863)
• DisplayMenuBar: User choice was not maintained. Did not affect the ESR. (bug 1996449)
• DisablePasswordReveal: The policy had stopped working. (bug 2001459)