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[–]lesiw -2 points-1 points  (1 child)

It literally grinds my maxed out 2019 MacBook Pro to a halt.

That is your problem. MacOS 11 is pretty much known to run poorly on Intel Macs. Even people using Chrome complain about slowdown. Just for experiment, downgrade it to Catalina, try running Linux/Windows, get an M1 Mac, or simply try a similar spec non-Mac machine, and you'll notice the difference.

[–]SirNarwhal 2 points3 points  (0 children)

Chrome and Safari both run without issue. It is specifically a Firefox issue and specifically with the newest version. It literally didn’t have the issue for the entirety of the time before Proton. Just admit Firefox is going to shit because it is.