@dec_hl Unless you're willing to make do with forks of the former with more or less the same problems.. basically unobtanium yes. You could try something like Zen browser (haven't tried myself but heard others like it), but that's a Firefox fork, so if Firefox truly goes down the drain, so does it, too.

I personally don't find Firefox slow though honestly, except maybe if you're browsing websites like Youtube that insert sleep cycles to make Firefox appear slow- try spoofing your user agent :P