I am very curious as well.

I have zero issues using FF everywhere. I used to have to use Chromium every couple months because some dumb website was pulling in a library that was using some non-industry-standard thing chromium did - and everything broke due to their utter lack of testing - but even that has died down. There is a newer trend where I have to disable uBlock every once in a while to complete a task, which is just as bad, but I rarely have to actually use another browser.