Release dates for Firefox Extended Support Releases (ESR), for all supported ESR branches. https://whattrainisitnow.com/release/?version=esr en-US Tue, 29 Sep 2026 13:00:00 +0000 1440 Firefox ESR release 153.4.0 shipped on September 29, 2026 https://www.firefox.com/en-US/firefox/153.4.0/releasenotes/ https://www.firefox.com/en-US/firefox/153.4.0/releasenotes/ Tue, 29 Sep 2026 13:00:00 +0000 Firefox ESR release 140.17.0 shipped on September 29, 2026 https://www.firefox.com/en-US/firefox/140.17.0/releasenotes/ https://www.firefox.com/en-US/firefox/140.17.0/releasenotes/ Tue, 29 Sep 2026 13:00:00 +0000 Firefox ESR release 115.42.0 shipped on September 29, 2026 https://www.firefox.com/en-US/firefox/115.42.0/releasenotes/ https://www.firefox.com/en-US/firefox/115.42.0/releasenotes/ Tue, 29 Sep 2026 13:00:00 +0000 Firefox ESR release 153.3.0 shipped on September 15, 2026 https://www.firefox.com/en-US/firefox/153.3.0/releasenotes/ https://www.firefox.com/en-US/firefox/153.3.0/releasenotes/ Tue, 15 Sep 2026 13:00:00 +0000 Firefox ESR release 140.16.0 shipped on September 15, 2026 https://www.firefox.com/en-US/firefox/140.16.0/releasenotes/ https://www.firefox.com/en-US/firefox/140.16.0/releasenotes/ Tue, 15 Sep 2026 13:00:00 +0000 Firefox ESR release 115.41.0 shipped on September 15, 2026 https://www.firefox.com/en-US/firefox/115.41.0/releasenotes/ https://www.firefox.com/en-US/firefox/115.41.0/releasenotes/ Tue, 15 Sep 2026 13:00:00 +0000 Firefox ESR release 153.2.0 shipped on September 1, 2026 https://www.firefox.com/en-US/firefox/153.2.0/releasenotes/ https://www.firefox.com/en-US/firefox/153.2.0/releasenotes/ Tue, 01 Sep 2026 13:00:00 +0000 Firefox ESR release 140.15.0 shipped on September 1, 2026 https://www.firefox.com/en-US/firefox/140.15.0/releasenotes/ https://www.firefox.com/en-US/firefox/140.15.0/releasenotes/ Tue, 01 Sep 2026 13:00:00 +0000 Firefox ESR release 115.40.0 shipped on September 1, 2026 https://www.firefox.com/en-US/firefox/115.40.0/releasenotes/ https://www.firefox.com/en-US/firefox/115.40.0/releasenotes/ Tue, 01 Sep 2026 13:00:00 +0000 Firefox ESR release 153.1.0 shipped on August 18, 2026 https://www.firefox.com/en-US/firefox/153.1.0/releasenotes/ https://www.firefox.com/en-US/firefox/153.1.0/releasenotes/ Tue, 18 Aug 2026 13:00:00 +0000 Firefox ESR release 140.14.0 shipped on August 18, 2026 https://www.firefox.com/en-US/firefox/140.14.0/releasenotes/ https://www.firefox.com/en-US/firefox/140.14.0/releasenotes/ Tue, 18 Aug 2026 13:00:00 +0000 Firefox ESR release 115.39.0 shipped on August 18, 2026 https://www.firefox.com/en-US/firefox/115.39.0/releasenotes/ https://www.firefox.com/en-US/firefox/115.39.0/releasenotes/ Tue, 18 Aug 2026 13:00:00 +0000 Firefox ESR release 153.0 shipped on July 21, 2026 https://www.firefox.com/en-US/firefox/153.0/releasenotes/ https://www.firefox.com/en-US/firefox/153.0/releasenotes/ Tue, 21 Jul 2026 13:00:00 +0000 Firefox ESR release 140.13.0 shipped on July 21, 2026 https://www.firefox.com/en-US/firefox/140.13.0/releasenotes/ https://www.firefox.com/en-US/firefox/140.13.0/releasenotes/ Tue, 21 Jul 2026 13:00:00 +0000 Firefox ESR release 115.38.0 shipped on July 21, 2026 https://www.firefox.com/en-US/firefox/115.38.0/releasenotes/ https://www.firefox.com/en-US/firefox/115.38.0/releasenotes/ Tue, 21 Jul 2026 13:00:00 +0000 Firefox ESR release 140.12.0 shipped on June 16, 2026 https://www.firefox.com/en-US/firefox/140.12.0/releasenotes/ https://www.firefox.com/en-US/firefox/140.12.0/releasenotes/ Tue, 16 Jun 2026 13:00:00 +0000 Firefox ESR release 115.37.0 shipped on June 16, 2026 https://www.firefox.com/en-US/firefox/115.37.0/releasenotes/ https://www.firefox.com/en-US/firefox/115.37.0/releasenotes/ Tue, 16 Jun 2026 13:00:00 +0000 Firefox ESR release 140.11.0 shipped on May 19, 2026 https://www.firefox.com/en-US/firefox/140.11.0/releasenotes/ https://www.firefox.com/en-US/firefox/140.11.0/releasenotes/ Tue, 19 May 2026 13:00:00 +0000 Firefox ESR release 115.36.0 shipped on May 19, 2026 https://www.firefox.com/en-US/firefox/115.36.0/releasenotes/ https://www.firefox.com/en-US/firefox/115.36.0/releasenotes/ Tue, 19 May 2026 13:00:00 +0000 Firefox ESR release 140.10.2 shipped on May 7, 2026 https://www.firefox.com/en-US/firefox/140.10.2/releasenotes/ https://www.firefox.com/en-US/firefox/140.10.2/releasenotes/ Thu, 07 May 2026 13:00:00 +0000 Firefox ESR release 115.35.2 shipped on May 7, 2026 https://www.firefox.com/en-US/firefox/115.35.2/releasenotes/ https://www.firefox.com/en-US/firefox/115.35.2/releasenotes/ Thu, 07 May 2026 13:00:00 +0000 Firefox ESR release 140.10.1 shipped on April 28, 2026 https://www.firefox.com/en-US/firefox/140.10.1/releasenotes/ https://www.firefox.com/en-US/firefox/140.10.1/releasenotes/ Tue, 28 Apr 2026 13:00:00 +0000 Firefox ESR release 115.35.1 shipped on April 28, 2026 https://www.firefox.com/en-US/firefox/115.35.1/releasenotes/ https://www.firefox.com/en-US/firefox/115.35.1/releasenotes/ Tue, 28 Apr 2026 13:00:00 +0000 Firefox ESR release 140.10.0 shipped on April 21, 2026 https://www.firefox.com/en-US/firefox/140.10.0/releasenotes/ https://www.firefox.com/en-US/firefox/140.10.0/releasenotes/ Tue, 21 Apr 2026 13:00:00 +0000 Firefox ESR release 115.35.0 shipped on April 21, 2026 https://www.firefox.com/en-US/firefox/115.35.0/releasenotes/ https://www.firefox.com/en-US/firefox/115.35.0/releasenotes/ Tue, 21 Apr 2026 13:00:00 +0000 Firefox ESR release 140.9.1 shipped on April 7, 2026 https://www.firefox.com/en-US/firefox/140.9.1/releasenotes/ https://www.firefox.com/en-US/firefox/140.9.1/releasenotes/ Tue, 07 Apr 2026 13:00:00 +0000 Firefox ESR release 115.34.1 shipped on April 7, 2026 https://www.firefox.com/en-US/firefox/115.34.1/releasenotes/ https://www.firefox.com/en-US/firefox/115.34.1/releasenotes/ Tue, 07 Apr 2026 13:00:00 +0000 Firefox ESR release 140.9.0 shipped on March 24, 2026 https://www.firefox.com/en-US/firefox/140.9.0/releasenotes/ https://www.firefox.com/en-US/firefox/140.9.0/releasenotes/ Tue, 24 Mar 2026 13:00:00 +0000 Firefox ESR release 115.34.0 shipped on March 24, 2026 https://www.firefox.com/en-US/firefox/115.34.0/releasenotes/ https://www.firefox.com/en-US/firefox/115.34.0/releasenotes/ Tue, 24 Mar 2026 13:00:00 +0000 Firefox ESR release 140.8.0 shipped on February 24, 2026 https://www.firefox.com/en-US/firefox/140.8.0/releasenotes/ https://www.firefox.com/en-US/firefox/140.8.0/releasenotes/ Tue, 24 Feb 2026 13:00:00 +0000