A good chunk of websites are just broken with Firefox and their not even broken in obvious ways. Some times they fail to load, sometimes they render weirdly, sometimes their just unresponsive. I use Firefox as my main browser but I always have something chromium based as my backup for when a website I wanna use just doesn’t work. A lot of the time I don’t even think to use it and assume the site would be broken on chromium as well but nope. Its almost always Firefox:/.