It’s also really rough for me on Windows too. I try it every months a new release comes out and I don’t last a day.

Sites render badly (names colors and fonts look wrong on Firefox but look the same on Edge Chrome and Safari (macOS))

It hangs multiple times a day

Some heavy JS sites are much slower in FF than Chromium

It takes dev tools minutes to become responsive on the site I work on, while in Chromium they load up very quickly.