There’s also the little issue of firefox not supporting HDR videos which with more and more OLED/miniLED monitors out there is a major drawback. I love FF and i daily drive it, but there are some glaring gaps in the feature set between chromium and ff.
I had the same issue on my iPhone! You can (temporarily) enable WebGPU by going to Settings > Safari > Advanced > Experimental features (I don't know what it's called in English, but it's the bottom one).
Apparently nightly is supposed to support it: https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Exp...