Firefox ESR
Release Notes

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.

115.21.0 Firefox ESR

March 4, 2025

Version 115.21.0, first offered to ESR channel users on March 4, 2025

Firefox ESR 115 is now supported only on Windows 7-8.1 and macOS 10.12-10.14. Users on other operating systems should use Firefox ESR 128 instead.

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