This is one of the reasons I still use Chromium primarily. Firefox fanatics are just too much like cult members. You can point out real issues to them, like that Firefox was slow to implement hardware-accelerated video decoding on Linux, or that Firefox also enables a bunch of telemetry by default... but half of their identity is based on using Firefox, so they take it personally. I'd love to have a technical discussion with some of these Firefox cultists, but to be honest most of them will just resort to ad-hominem attacks because that is the only argument they have.