[abdullahkhalids]

What's preventing the Mozilla Corporation from selling "e-merchandise", like a sequence of themes for $1, $5, $10, $100, etc, to raise money?

[IshKebab]

Probably nothing, but again I suspect they don't bother because it would be a drop in the ocean and certainly not worth the "Mozilla is selling out!" backlash you'd get from the sort of people that use Firefox.