Yes, Google provides 90% of the revenue or somewhere around there. But I still haven't heard how exactly Mozilla is doing special favors to Google or is in some way beholden to it.
Mozilla has a contract with Google to be the default search provider for a set period of years. I have never heard of anything else being in there that allows Google to make any product requests on Mozilla.
How come no one wants to say how exactly Mozilla is doing what Google wants?
All ad supported products have bad incentives. It’s the same reason HBO and Nerflix produces great TV shows and ad based broadcast and cable networks mainly produce garbage.
https://techcrunch.com/2017/09/25/apple-switches-from-bing-t...
Whenever your earnings depends on someone giving you money, whether it's through advertising or a grant, it's quite normal and common you'll be very careful not to upset them. At least you'll think twice before doing so.