This is a staging environment for
whattrainisitnow.com
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.
| Releases calendar |
| Firefox |
ESR |
Old ESR |
Date |
| 142 |
140.2 |
128.14 - 115.27
|
August 19
|
| 143 |
140.3 |
115.28
|
ESR 128 branch is EOL
September 16
|
| 144 |
140.4 |
115.29
|
October 14
|
| 145 |
140.5 |
115.30
|
November 11
|
| 146 |
140.6 |
115.31
|
December 9
|
| 147 |
140.7 |
115.32
|
January 13
|
| 148 |
140.8 |
115.33
|
February 17
|
| 149 |
140.9 |
|
ESR 115 branch is EOL
March 17
|
| 150 |
140.10 |
|
April 14
|
| 151 |
140.11 |
|
May 12
|
| 152 |
140.12 |
|
June 9
|
| 153 |
153.0 |
140.13
|
New ESR 153 branch!
July 14
|
| 154 |
153.1 |
140.14
|
August 11
|
| 155 |
153.2 |
140.15
|
September 8
|
| 156 |
153.3 |
|
ESR 140 branch is EOL
October 6
|
| 157 |
153.4 |
|
November 3
|
| 158 |
153.5 |
|
December 1
|
| 159 |
153.6 |
|
January 12
|