Firefox is usually great for me, but with Chromium-based browsers having such a massive market share monopoly I do occasionally find a website that doesn't work properly on Firefox. But, I will stick with Firefox as long as possible.
Yeah I keep hearing this but it never pans out, seems like in my experience a lot of people don’t know they might have to turn off an extension or two (ublock, built-in trackers, etc) to get a website to work.