Firefox got to 30% by being a good browser. An alternative take on why it is now lower: not because of dark patterns but because Google genuinely built a better product. I'm a Firefox user, but because of stubbornness. In all honesty, I find Chrome easier to use and less cluttered.
yes, back when browsers sucked. Performance is hardly the reason of choosing a browser these days, personal preferences, what you are used to, what is given to you, etc...its a good argument for why Google needs to be broken up.