I&#x27;m fairly sure the revenue attributable to Firefox dwarfs what any of the bigger competitors are spending on their browsers, so it&#x27;s not really for lack of resources if Firefox falls behind. But it&#x27;s the cash cow that subsidizes pretty much everything Mozilla does, some of which is great and some dubious. Everyone can make their own case for which projects are great and which are iffy.<p>Personally, I would think an e-mail client is the perfect complement to browser development, and something that could&#x2F;should be another significant source of revenue instead of a burden.