I keep chromium installed mostly to run virtual tabletop software (specifically Foundry VTT), because webgl performance in firefox is not great (though it has improved somewhat in the last couple of years). There are also a few sites (mostly restaurants for some reason) that just refuse to work properly in firefox, so I sometimes fall back to chromium. I wish I could drop it like a bad habit, because frankly Google's shenanigans piss me off on a semi-regular basis.