I just got the newer version of Firefox (v157.0) and I'm amazed at how snappy it is. It feels like Firefox does when you have 0 extensions, except that I have uBO and a few others.
It used to feel so sluggish, pages took 500ms or even 1 second to display anything after typing the address, but no more; they render almost instantly.
A very nice surprise indeed!
If you left Firefox because it was too slow, now's the time to ditch Chrom{e,ium} and reign Google's chokehold on standards and utter contempt for privacy in!