Yes, recently they decided to support ESR 115 for a little longer. I don't know if there's exact deadline right now.

According to https://whattrainisitnow.com/release/?version=esr the Firefox 115.15.0esr on Sept 3 will be the last update for the older Fx 115 ESR channel.

At least Mozilla supported the EOL Windows 7, 8, 8.1 with Fx 115ESR for much longer compared to when Chrome/Chromium based browsers dropped Windows 7, 8, 8.1 back in Jan/Feb 2023.

It is possible Mozilla may decide to continue with some more stability/security updates for the old Fx 115 ESR channel.

Firefox 116.0 and later dropped support for Windows 7, 8, 8.1 so if that is indeed the case then some Firefox fork builder may be able to back port security fixes to the old Fx 115ESR to build or somehow build current Releases for Win7, 8, 8.1.

See also:

• https://old.reddit.com/r/firefox/comments/1de7bu1/were_the_firefox_leadership_team_at_mozilla_ama/l8gcjth/
• https://old.reddit.com/r/firefox/comments/1dyf8sb/mozilla_considering_further_extending_support_for/?rdt=41307

Hi m.fessier1:

Just an FYI that the official Firefox release calendar at https://whattrainisitnow.com/calendar/ now shows that support for Firefox ESR v115.x has been extended to March 2025.

Once Firefox ESR v115.21 is released on 04-Mar-2025 Mozilla will decide if a further extension is required. See Martin Brinkmann’s 09-Aug-2024 ghacks.net article Mozilla extends Firefox 115 support for old Windows and macOS devices for more information.

As of today, Mozilla still has not updated the end-of-support date in the support article Firefox users on Windows 7, 8 and 8.1 moving to Extended Support Release.

Dell Inspiron 15 5584 * 64-bit Win 10 Pro v22H2 build 19045.4780 * Firefox v130.0.0 * Microsoft Defender v4.18.24070.5-1.1.24070.3 * Malwarebytes Premium v5.1.10.127-1.0.5021 * Macrium Reflect Free v8.0.7783

Hi m.fessier1: Just an FYI that the official Firefox release calendar at https://whattrainisitnow.com/calendar/ now shows that support for Firefox ESR v115.x has been extended to March 2025. Once Firefox ESR v115.21 is released on 04-Mar-2025 Mozilla will decide if a further extension is required. See Martin Brinkmann’s 09-Aug-2024 ghacks.net article Mozilla extends Firefox 115 support for old Windows and macOS devices for more information.

ghacks is only partially correct.

https://whattrainisitnow.com/release/?version=esr

We decided to extend support for ESR 115 only on Windows 7-8.1 and macOS 10.12-10.14 up to March 2025. We will re-evaluate this decision in early 2025 and announce any updates on ESR 115's end-of-life then.