@jwz Let me get this straight:
Mozilla, which is perpetually short of money and facing dire funding shortfalls, bought an advertising company that was so wildly successful that it could be purchased by a non-profit that was perpetually short of money and facing dire funding shortfalls?
Sure reads like a successful company to me! I'm sure this will work out great, and isn't just a deal brokered by a VC to get an underperforming investment off his balance sheet before it cratered.