I always had given Firefox another choice, but throws me out of websites, unoptimized websites and font issues etc. stopping me from using it. I really wish Firefox tighten up their game.
Do you have examples of these? It's helpful to report them to the webcompat web-bugs repository as you discover them - e.g. https://github.com/webcompat/web-bugs/issues/36955 - https://webcompat.com/ has more information on the project.