[_tulpa]

Have you used Firefox since Quantum was released?

I switched back to Firefox around version 57, and the only 'performance issue' was initially having to re-learn stuff that was muscle memory in Chrome. Once I got up to speed the user experience is indistinguishable from Chrome - even on the crappy old netbook I sometimes have to use.

The thing that might kill firefox is the aforementioned shitty web devs with their bogus UA checks, Firefox having a history of bad performance/stability, and most people already using Chrome with no reason to consider switching.