I fail to understand how they haven't figured out a way out of this seems to me they're using all the money they from Google as if there is no tomorrow... Why on earth also if Firefox is so clearly their main product does it seem to not always be at the centre of their attention?

The answer to the second question is the answer to the first - there have been a ton of attempts at alternative sources of funding, but it's hard to come close to the ~half a billion USD the default search deal provides. So far the branded services you're calling for don't seem to have been able to pull it off, and I haven't seen any signs that donations would be able to either.

(Although as for email with Thunderbird...)