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Unfortunately that has not been the case for me. Some sites for buying concert tickets don’t seem to like Firefox.
I’ve had problems with several Microsoft sites we use internally for work ever since Edge went to Chrome.
It’s not Firefox’s fault. Mozilla is abiding by web standards.
If you find any websites that don’t work with firefox, you should report them to Mozilla. Firefox has a list of known bad websites, and has fixes for them, usually just a user agent override.