Random question:
Do you use safari?
Do you see significant performance differences with chrome?
Do you see broken/partially broken websites on safari vs chrome ?
I only use Safari on my personal computer. And at work I use Firefox for development, and Safari for personal stuff. I used to use Chrome but nowadays it's very rare (testing something specific).
The thing is, Chrome actually feels snappier than both Firefox and Safari when I am using it, probably because it's profile is empty (almost no extensions, no history, etc.).
I rarely see broken websites, with any browser. And usually it's because of my ad-blocking extensions. Google websites are slower on Firefox, but rumours are saying that it's almost on purpose… (one more reason to not use Google products like Chrome).
On my 2017 MacBook Pro with touchbar I don't notice the performance hit, but on my 2015 MacBook Pro the whole system freezes with Firefox. What completely solves this however is enabling 'low res mode' (right click app icon -> get info -> check the low-resolution checkbox). But, as the name suggest, Firefox now runs in non-retina resolution. It looks crappier, but I still prefer it to other browsers.
Haven't noticed any memory bloat myself though (= it consumes a lot of memory, like any browsers). It's somewhere between Safari and Chrome.