This is a staging environment for whattrainisitnow.com

Firefox ESR 140 & 153

Version shipping to end-users on the ESR channel

We have decided to extend support to ESR 115 only on Windows 7-8.1 and macOS 10.12-10.14 up to March 2027.

Upcoming ESR releases
Firefox	ESR	Old ESR	Shipping date
2026 ↓
157	153.4	140.17 - 115.42	September 29
158	153.5	115.43	ESR 140 is EOL → Updates to ESR 153 October 13
159	153.6	115.44	October 27
160	153.7	115.45	November 10
161	153.8	115.46	November 24
162	153.9	115.47	December 8
2027 ↓
163	153.10	115.48	January 12
164	153.11	115.49	January 26