I don't think I've ever updated my userChrome.css file, certainly not in the past few years. The browser chrome is pretty stable since this is how the browser i

I don't think I've ever updated my userChrome.css file, certainly not in the past few years. The browser chrome is pretty stable since this is how the browser itself is styled, so outside of big UI updates like Proton (which didn't even impact my own css) the chance of breakage is pretty slim.