how would the loss of funding put Firefox in better shape? Are you saying that exposure would mean dollars would flow in from donations from new users?
I am not sure that I agree. Specifically, I doubt that mozilla would be able to realize any revenue even if every OEM made Firefox the default browser.
If Android OEM's aren't locked into Chrome, they'll probably request payment from Edge, Brave and other startup browsers to be the default. Whoever pays most will get the spot. And that browser will end up being ad-ridden to help pay for that.
I could totally imagine browsers having ad-blockers that don't block ads, but merely replace "bad" website-provided ads with browser-provided "good" ads.
Mozilla will need to find a way to raise funds.