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websites not supporting firefox is the site's fault, not the browser's. firefox is not some niche browser. almost every website i have used is fine on firefox, and when it rarely doesnt work (usually bc i have a configured librewolf), i just open brave or whatever.
I just use chrome when it doesn't work since it's such a rare occurrence. There is no reason for me to use chrome on a daily basis.
Not everyone has this luxury, but I just close the website and never use it. So far, I haven't run into anything major that doesn't work with firefox, so this strategy has been working for me so far.
i'd recommend using edge there instead of chrome, because it's the same browser and google is legitimately less trustworthy than microsoft at this point. neither of these companies are the same that they were in the early 2000s, for better or worse
I occasionally switch to chrome as a troubleshooting step when a website doesnt work, and it rarely is firefox the problem.