This is a staging environment for whattrainisitnow.com

Firefox ESR 140 & 153

Version shipping to end-users on the ESR channel

Last release	July 21, 2026
Latest version (old branch)	140.13.0
Latest version (new branch)	153.0

We decided to extend support for ESR 115 only on Windows 7-8.1 and macOS 10.12-10.14 up to March 2026.
We will re-evaluate this decision in February 2026 and announce any updates on ESR 115's end-of-life then.

Upcoming ESR releases
Firefox	ESR	Old ESR	Shipping date
2026 ↓
154	153.1	140.14	August 18
155	153.2	140.15	September 15
156	153.3		ESR 140 branch is EOL October 13
157	153.4		November 10
158	153.5		December 8
2027 ↓
159	153.6		January 19