Where are all the people threatening to leave
The implication being that Firefox should not even bother trying to compete and win new users, all it needs to do is please its ever-dwindling userbase of grouchy geeks. I know you'll respond "well without us they'll have no users at all", but that's a pretty depressing argument to have to make, isn't it?
The economics is simple: nobody is going to pay for their product, they have to find an income and this is what they've landed on, presumably after studying the market carefully - their jobs count on it, after all. Have you done that and found an alternative magic solution that keeps everyone happy? If so, tell them.
But this vision of 90s-style nerd-friendly browser which doesn't even try to track the competition and yet somehow manages to remain relevant - I just don't buy it.