You know that Firefox is Google right? Like, literally, Google is the main company paying Firefox's developers, and if they don't do what Google says, Google can just cut the funding, and they all end up unemployed, right ? Of course, to avoid a monopoly, Google would need to fund a different browser instead, but still, people have families to feed.
If you want to cut dependencies on Google, Firefox is not the answer, and neither is Tor or any other Firefox derived web-browser.
I think stating that Google controls Firefox is vastly overstating the degree of influence.
I think the default for some time was DuckDuckGo, and that helped raise them out of complete obscurity, but it didn't reshape the internet landscape.
Then we're doomed...