I’m trying to locate an RPM for v108.x of Firefox. I tried running “dnf downgrade firefox”, but that only gets up to Firefox 106. I wanted 108 as that’s the last version before they broke the Overflow Menu and forced the Extensions icon on us.
You can find it here
https://koji.fedoraproject.org/koji/buildinfo?buildID=2110479
But keep in mind that there could be dependency issues.
Also consider that you can’t use FF 108 forever 
It would be better to find a suitable solution with the latest version.
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A suitable solution will probably require an extension that forces the browser to behave like it did before, or switching to something like Waterfox (not going to use any Chromium-based browsers, that’s for certain).