If Firefox goes under or gets to a low enough % of users on the Internet, companies are going to stop supporting it (kind of already are) which would be literally handing the Internet to Google to make all the rules, decide which technologies to deprecate, which to introduce (web attestation for example). Good luck getting a new browser to be supported anywhere after that.

But they refuse to engage with that, they go on the defensive. "You will pay for disturbing my quiet enjoyment of treats "