I feel like a lot of companies stopped testing for Firefox and those issues get attributed to Mozilla (not that some performance issues aren't their fault, but I've definitely encountered issues that get attributed to Mozilla but are failures to test for a different rendering engine).

I use Safari or Edge as a fallback if I run into issues. Google seems to spend a lot of time specifically optimizing their apps (gmail, meet) for Chrome... so I tend to keep Chrome around specifically for those cases. I still find that Edge and Safari have more issues than Firefox.