115.34.0 Firefox ESR

March 24, 2026

Version 115.34.0, first offered to ESR channel users on March 24, 2026

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 140 instead.

https://www.firefox.com/en-US/firefox/115.34.0/releasenotes/?redirect_source=mozilla-org&utm_source=firefox-browser&utm_medium=firefox-desktop&utm_campaign=about-dialog