It wasn't just bad press, someone here posted a link to a "biggish" organization in, I think, Australia where they were asking people to boycott Mozilla by not using it's software.
Neither OkCupid nor Proposition 8 appear anywhere in that list: it records donations to the Republican Party or candidates from ordinary employees of OkCupid's corporate parent, IAC.
Also, almost all of the donations predate OkCupid's acquisition by IAC in February 2011.