Strange, usually things just work there considering the limited hardware variety. Is it an older Mac? I’m typing this on an M2 macbook and it works perfectly.

Anyway try to dig into the config and check if you’re using hardware rendering: https://fedoraproject.org/wiki/Firefox_Hardware_acceleration

If it turns out you’re using software rendering try forcing hardware rendering on: https://jamcity.helpshift.com/hc/en/6-genies-and-gems/faq/5737-how-do-i-enable-hardware-acceleration-on-my-browser/