Best recourse would be a credit card chargeback. If Paypal, probably a writeoff. The trickier part is, it's unknown whether StartCom will backdate more certifi

Best recourse would be a credit card chargeback. If Paypal, probably a writeoff. The trickier part is, it's unknown whether StartCom will backdate more certificates, triggering Mozilla to block them entirely. That could happen well after the window where you're allowed to request a chargeback. Although I do believe it's extremely unlikely that they will. Unless Google and Microsoft follow suit, such an action is just as likely to damage Mozilla as it is to damage StartCom. People who just want to access websites will not bother to understand the reason why suddenly only Firefox is refusing to let them view their pages.