> they are still playing catch up on the desktop market
It's not the sort of wave you turn in a month. 57 is a big release, give it time. It had a massive surge of good press, which is a good sign. If they can come up with developer tools that can beat Chrome at something, they will see numbers go up.
> totally irrelevant on mobile.
They are making inroads on Android, which is the only market they will ever play into. iOS will only be cracked open by legal coercion. Anything else is wishful thinking.
> But they have enough money to last years
Mozilla is not just a company, it's basically a public institution. Their role is to champion a view of the web as an open utility, not to be the most popular widget maker. They don't need bazillions of money to do that.