They collect a lot of personal information and considering Marc Andreessen is on the board of Facebook I won't trust a browser that has questionable practises like Facebook.
Regardless there are addons which do what RockMelt does. The UI also is off, even if someone doesn't realise it. It is behind in updates so not good for security reasons.
well if its got a deal with google similar to mozilla's it can make a good chunk of change with commissions on searches. mozilla generates well over $100M/year from google deal.
This figure appeared absurdly high to me on first glance, but Wikipedia says Mozilla earned $61.5M from search royalties in 2006. Total revenues were $104.3M in 2009, putting the estimated amount from search at around ~$90M. I don't know that that's necessarily all Google, but still an impressive sum.
