Firefox works well enough for me. Never given me any problems or grief. I don't really understand the fascination with chromium forks or the insistence on using them instead of Mozilla's engine.
Unfortunately there are enough websites that are broken and don't work in Firefox... and some of them I just cannot avoid using (company tools, recruitment platforms etc.) because I am position where they can just tell me to use Chrome or GTFO.
I get the company stuff but I honestly can't think of a single site in any recent history that harassed me about using Firefox. If it does I just look for alternatives or irritably switch to edge or whatever for a couple of minutes. It's not something I've even had to consider to be an issue tbh