Firefox ESR 128 & 140

Last release August 19, 2025
Latest version (old branch) 128.14.0
Latest version (new branch) 140.2.0
Releases calendar
Firefox ESR Old ESR Date
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
148 140.8 February 17
149 140.9 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