Firefox 116.0 and later requires Windows 10, 11 to run.

The latest version to still support the EOL Windows 7, 8, 8.1 (and macOS 10.12, 10.13, 10.14) is Firefox 115 ESR which is currently at Fx 115.18.0esr and will be supported till at least Fx 115.21.0esr in March 2025.

Each folder is the language like say en-CA/ en-GB/ en-US/ for the English versions. https://archive.mozilla.org/pub/firefox/releases/115.18.0esr/win64/ https://archive.mozilla.org/pub/firefox/releases/115.18.0esr/win32/

https://support.mozilla.org/en-US/kb/firefox-users-windows-7-8-and-81-moving-extended-support

Pretty much every other major web browser already stopped supporting the eol Windows 7, 8, 8.1 back in Jan/Feb of 2023.

Dear James, Thank you for your answer and I wish you a Happy New Year! Windows 7 64 bit is an OS that many people continue using it. All those people know that maybe there are some security cases and they protect their PCs with Antivirus Software etc. From the other side we all know that Mozilla Firefox tries to keep its existence in Internet Browsing and a lot of people have moved to other browsers. So, although I would like to keep Firefox as my favorite browser I am going to move to another browser because Firefox stopped supporting me, although it continues to support older Linux OS systems and I am glad about it. You know, there is a great programmer who has constructed Vuescan software and he managed to give life to all the scanners all over the world old and new and the vuescan is a software which is compatible with all OSs. What a pity for Firefox! If something changes, please let me know!

Supporting an OS takes time and resources for development and testing etc. However many people still use Windows 7, significantly more use later versions.

Software developers have to draw the line somewhere, else they would still be spending their time coding applications for Windows 95, 98, XP etc.

That said, Windows 7 is still supported in some versions of Firefox, even if not in the regular version.

So, although I would like to keep Firefox as my favorite browser I am going to move to another browser because Firefox stopped supporting me, although it continues to support older Linux OS systems and I am glad about it.

Windows 7 reached its End of Life date back on January 14, 2020.

Mozilla is still supporting Windows 7, 8, 8.1 with the older Firefox 115 ESR as I mentioned. Early this year they will decided whether to continue to spend more resources in extending updates again past March. How much longer should they support two years?, five years? ten?.

Meanwhile every other major web browser out that that is pretty much Chrome or Chromium based has already dropped support of the EOL Windows 7, 8, 8.1 back in Jan/Feb of 2023. Other browsers are what forks based on Firefox and due to that it is not like some fork made by one or two people will still be supporting Windows 7, 8, 8.1 longer after Mozilla stops (with Fx 115 ESR) as back porting security patches and stability fixes and testing/maintaining is not something everybody is willing to do. Though the third-party TenFourFox project was one of those rare cases of still supporting rather old EOL MacOS's with Firefox versions for several years.

Perhaps another browser that is still supporting Windows 7, 8, 8.1 at moment is SeaMonkey.

Dual booting with a Linux distro is about your only option in being able to use a current version of Firefox in long run along with other web browsers besides updating to Windows 10.