Phishers and scammers have developed a new tactic for separating victims from their money that involves getting them to pay for software that s normally free. The new scam is offering users the opportunity to download applications such as Flash, Firefox and Opera, that are free in their legitimate forms. The attackers ask only that victims then send an SMS message to a premium rate number that will cost them in the vicinity of $5.60. One of the downloads offered is a beta version of Firefox 4 that allegedly includes an anti-virus update.
Source: https://threatpost.com/scam-sites-demanding-sms-payment-fake-flash-firefox-downloads-011711/74852/