Mozilla is a Google funded project whose main driving force is keeping up with Chrome, isn't it? It's not like they determine browser standards... Google and Apple set those and everyone else follows or dies.

Edit: Even in the IE days they were always playing catchup. Firefox is just the poor/free man's alternative to the corporate browser of the moment. They don't really steer the ship, just follow trends.

And these days Mozilla is basically an adware company anyhow. They just keep bundling random crap with their browser.