[WarOnPrivacy]

> I can’t even register for GitHub on Firefox due to laggy animations.

You aren't kidding. On Firefox 120 it ramps up a Xeon core to >50% and floors my GPU 3D at 100%.

I opened on Opera and CPU is negligible, GPU is steady at 15% (which still seems high for a throwaway web background).

for those playing along at home: https://github.com/signup?source=login

[AntronX]

My CPU was at 27% (i3-4130) and 27 watts power use vs. 11w at idle. Added uBlock filter: github.com##div.signup-stars and CPU was back to 1%. Background stars animation is the culprit.