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It only affects Apple processors. From the FAQ:

Yes (with a very high chance), if you have a device running macOS or iOS with Apple's A-series or M-series CPUs. This includes all recent iPhones and iPads, as well as Apple's laptops and desktops from 2020 and onwards.

The only reason why attack works on all browsers is because Apple force all browsers on their platform to use Webkit. This is why it's Apple problem.

That’s only true for the iOS related platforms. Nice old MacOS still lets you run any browser you want, including one you’ve developed yourself if you so wish.

It works on webkit. Firefox isn't affected on MacOS, but it is on iOS because apple forces the use of webkit there.