Firefox ESR 115.25.0, ESR 128.12, and ESR 140.0 released

[Donal Meehan]

We are pleased to announce the release of three new Firefox ESR versions today: 115.25.0, 128.12.0, and 140.0.

All are available for download at https://www.mozilla.org/firefox/organizations/all/.

Release notes for Firefox 128.12.0esr are available at https://www.mozilla.org/firefox/128.12.0/releasenotes/.

Firefox ESR 115.25.0 is also now available for Windows 7-8.1 and macOS
10.12-10.14 users per the previously-announced window of extended security
support for that release.
Release notes for Firefox 115.25.0esr are available at https://www.mozilla.org/firefox/115.25.0/releasenotes/.

Firefox ESR 140.0 is the first release from the ESR140 branch, which is slated to replace ESR128 on September 16, 2025. We recommend that organizations use this opportunity to test the new major release in their environment and provide any feedback ahead of the ESR140 End Of Life.

Release notes for Firefox 140.0esr are available at https://www.mozilla.org/firefox/140.0esr/releasenotes/

Thank you,

Donal Meehan,
Firefox Release Manager