Is unlimited system resource usage ok for you? If not, you should really re-evaluate your premise of performance differences. Fire up sys mon, activity mon, top, or what have you, open both browsers. Firefox wins on every metric by substantial amounts (memory for example wins by an order of magnitude).
Since I never max out my resources (mbp 2016, 16 gigs, entire workload happens on servers and not on my local machine) that doesn't really affect me - and with 50+ tabs open frequently, just go ahead and take my ram to keep them available, sure. Unused resources are wasted resources - and again, I'm never above 10gigs, maybe 12-13 if I have a local vm running.
Like I said: ux-wise, I'm not impacted negatively by using chrome, at all. If my laptops resources were more limited or my local workload was bigger, I'd probably check out Firefox, but since I'm not bottlenecked, why bother?
That logic works if you're not bounded on RAM, but it's not an inexhaustible resource; personally I'd rather keep it free for VMs or other high cost operations.
