There was a period in time, few years ago, when I was going back and forth between Firefox and Chrome, driven by alternate paranoia about privacy vs performance. These days I don't really have to. Firefox on Android, at least for the phones I regularly used, like several OnePlus from 7T up and now razr ultra, has been very stable. Only blip was the one month I was on Pixel 10- turns out they have special hardware optimization for Chrome that cripples Firefox on Pixel 10 otherwise. All the more reason to (return the phone and) stick to Firefox.