Project https://github.com/Eclipse-Community/r3dfox as FF clone works on Win 7! Not tested on XP nor Vista, yet.
Latest offline installer of FF is at https://download-installer.cdn.mozilla.net/pub/firefox/releases/123.0.1/win64/en-GB/
Unpacked FF / LW 123/124/125 x32/x64 works on Win 7 by borrowing libs from r3dfox project of the same version. Libs are:
lgpllibs.dll
mozglue.dll
xul.dll
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Finally working - FF 123 x32 for Win7! *
Addons: Enabled AV1 codec, WebRTC and JPEG XL format! -
Finally 32bit/64bit version of R3dactedFox 124.0.3 + portable *
Original from Eclipse-Community's repo. This one rocks, too! -
Mercury 122.0.2 64bit works on Win 8.1 and with VxKex 1.1.1+ on Win 7.
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Thunderbird 127.0.a1 x86+x64 works on Win 8.1.
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Thunderbird 125.0 x86+x64 works on Win 7, too. You need to enable VxKex 1.1.1.
x86 version got bug - can not browse plugins/themes.