Except where noted, everything here applies to both Firefox 138 and the Firefox 128.10 ESR.

Bug Fixes

• When policy-installed addons are updated with new permissions, users are no longer shown a prompt; the addon is automatically re-enabled. This was fixed in bug 1907844.

Other Changes

• Firefox now supports the Content Analysis SDK for integrating DLP software. For more information, see this post.
• Firefox Labs is now controlled by Nimbus, our testing platform, so disabling telemetry also disables Firefox Labs.

Policies

• The DisabledCiphers policy has been updated to add additional ciphers.
• The SkipTermsOfUse policy has been added to not show the new terms of use. By using this policy, you represent that you accept and have the authority to accept the Terms of Use on behalf of all individuals to whom you provide access to this browser.
• The ContentAnalysis policy has been added.

Special Notes

Firefox ESR 140

Firefox 140 is the next ESR and will be released on June 24, 2025.