Lots of people can’t just straight up ditch it. I have had multiple websites just don’t work with Firefox regardless of whatever add-ons I put. For me I just go into a Windows sandbox, but there’s people who are not that tech savvy and it’s often forced on them. Also iirc most schools have chrome books they let students use. So it’s basically forced onto people.
If a website or app doesn’t test in Firefox, I avoid it. That’s something I run into like once a year, and I just use edge once if I need to, and avoid that website or app in the future. It’s not hard to support Firefox, it’s just a shitty ass business decision not to
Use a Chromium fork instead if you’re having so much trouble. Thorium is a decent alternative.
I have had multiple websites just don’t work with Firefox regardless of whatever add-ons I put.
Have you tried to change the browser’s user agent ?