Google thinks the same of me and I don't even edit the URL. I can have a session working just fine one night and come back the next day, open a new tab to search for something, and get captcha'd to hell. I'm fairly sure they just mess with Firefox on purpose. I won't install Brave, Chrome, or Edge out of principle either. Safari works fine, but I don't like it.
Google has gotten amazingly hostile toward power users. I don't even try to use it anymore. It almost feels like they actively hate people that learned how to use their tools
I think Google hates the loss of no/few ads or lame suggestions.