i found the latest build of firefox nightly that works on windows 7

[dight]

here's the latest version of firefox nightly that works on windows 7:

https://ftp.mozilla.org/pub/firefox/nightly/2023/07/2023-07-14-09-41-20-mozilla-central/ (en-us)

https://ftp.mozilla.org/pub/firefox/nightly/2023/07/2023-07-14-09-41-20-mozilla-central-l10n/ (other languages)

the installers for this build block any windows version under 10. so just get the .zip release.

 

be careful as firefox will immediately check for updates and install the latest version (which ofc doesn't work on w7). so either change the update options to check for updates but not automatically install them or use this registry tweak to disable firefox updates. keep in mind that the registry tweak will disable updates on all version of firefox except possibly the developer edition.

https://winaero.com/disable-updates-firefox-63-above/

[Mathwiz]

Warning: this version predates the WebP buffer overflow bugfix by nearly two months.

I tried running later versions (known to run on Win 8.1) with the help of VxKex, but had no luck. As a result, I'm sticking with 115 ESR.

Of course, if someone's willing to download the source code, apply the WebP fix, and rebuild this nightly release, I'd have no objection to that.