2. Not sure what your point is here. Mozilla needs to make money to maintain and improve its advocacy work
3. See point 1. You don't own or control Google's web services nor its domains therefore you have no full control of the build process if Google decides to shut down its services. If you want to see what community owned means, I suggest you look at the Python community. No hidden binaries or mysterious calls to corporate web services
4. Google's goal is to make money, Mozilla is to keep an open web. Obviously, Google has potential business conflicts while Mozilla doesn't, Mozilla wins even if it dies as long as the web is kept open, Google wins if it makes money full stop
You simply cannot compare them. Just look at Chrome in a fully Google-owned environment (Android), it does not even have extensions.