The bar to contribute to a software project of any size is many times higher than the bar to contribute to Wikipedia.
If you were speaking monetarily, Wikipedia has a gargantuan user count and good will to match, where Mozilla has spent the last few years squandering both of those.
I'm not talking about code contribution here, but about money. Wikipedia raises every year from donation more than what Mozilla gets from its pact with the devil.
I agree with you though that Mozilla has spent most of its good will, and that a donation-based model would have been much easier to pull-off a few years back than it is now.
If you were speaking monetarily, Wikipedia has a gargantuan user count and good will to match, where Mozilla has spent the last few years squandering both of those.