The most current version of Firefox 115 ESR is 115.16.1esr release yesterday for security updates. You https://www.mozilla.org/firefox/115.16.1/releasenotes/

https://www.mozilla.org/firefox/all/desktop-esr/ and download the Fx 115.16.1esr and not the Fx 128.3.1esr

The most current Firefox you can run on Windows 7, 8, 8.1 is Firefox 115 ESR. The good news is Mozilla has extended updates support till Fx 115.21.0esr in March 2025 currently. https://support.mozilla.org/en-US/kb/firefox-users-windows-7-8-and-81-moving-extended-support

Firefox 116.0 and later including Firefox 128.3.1 ESR and Firefox 131.0.2 Release requires Windows 10/11 to run.

Hello ! Mismatch , in my initial request, I'm running Firefox 115.15.0esr (not 116.16.0esr) , W8.1 Desktop plateform

"download the Fx 115.16.1esr and not the Fx 128.3.1esr" I've done exactly what is written above, many times before my present request. But I can't choose any level , the process is automatic , the final request : https://download.mozilla.org/?product.firefox.esr.latest.ssl&os=win&lang=fr The result gives 128 release, for win10, BUT I'm running w8.1 Seems to me, the process is wrong about selecting W10, in place of W8.1 Last upgrade to 115.15.0esr was done perfectly Sept 5th, no problem !!! Thans for any help !

Hmm they are no longer serving the older Firefox 115 ESR channel on the https://www.mozilla.org/firefox/all/desktop-esr/ though you may get served Fx 115.16.1esr on some other mozilla.org pages.

However to make it easier to get the Français locale of Firefox Setup 115.16.1esr.exe See https://archive.mozilla.org/pub/firefox/releases/115.16.1esr/win64/fr/

https://archive.mozilla.org/pub/firefox/releases/115.16.1esr/win64/ https://archive.mozilla.org/pub/firefox/releases/115.16.1esr/