I don't know if it's just my computer, but Firefox lags horribly on my Mac after a certain amount of usage whereby I always have to restart the browser because the experience after a certain amount of usage, even if there's only one or two tabs open, is unbearable. And right now, the only add-on I have on it as uBlock Origin.

Whereas Chrome can have over a dozen tabs open and it still operates well. Which is a shame because I was hoping to switch over back to Firefox.