Firefox ESR 128 & 140

Version shipping to end-users on the ESR channel

Last release	June 24, 2025
Latest version (old branch)	128.12.0
Latest version (new branch)	140.0

We decided to extend support for ESR 115 only on Windows 7-8.1 and macOS 10.12-10.14 up to September 2025.
We will re-evaluate this decision in August 2025 and announce any updates on ESR 115's end-of-life then.

Releases calendar
Firefox	ESR	Old ESR	Date
141	140.1	128.13 - 115.26	July 22
142	140.2	128.14 - 115.27	August 19
143	140.3		ESR 115 branch is EOL ESR 128 branch is EOL September 16
144	140.4		October 14
145	140.5		November 11
146	140.6		December 9
147	140.7		January 13