[gpm]

There are many ways to measure success, perhaps the easiest (though not necessarily the best) is money. Mozilla currently has net assets of >$1billion almost entirely earned off of it's back. It was without a doubt been a wildly successful product for the non-profit and to suggest otherwise is ludicrous. Likewise it continues to earn >$0.5billion/year revenue for that non-profit, to suggest that it doesn't continue to be a wildly successful product is ludicrous.

Could it have done even better for itself? Sure. Being the best possible version of yourself isn't necessary to have been successful though.