Years ago Firefox used to have a disclaimer of "Only use this software from official sources, you should never pay money for this software" kind of thing, becau

Years ago Firefox used to have a disclaimer of "Only use this software from official sources, you should never pay money for this software" kind of thing, because that practice happened all the time. Companies made money reselling Firefox to people who didn't know any better or weren't paying attention. No idea if Megaupload was responsible or not, but it was certainly a popular fraud.