Until today, I could open iTunes fine with Firefox from clicking on links to apps, but it stopped working all of a sudden. If I try to click on a link, it'll say that "Firefox doesn't know how to open this address, because the protocol (itms) isn't associated with any program." I tried going to the about:config page, but there aren't any strings that have the .itms/.itmss end on them, and I can't add them for some reason. I'll click on New>String>Enter name>Enter value>OK, but it doesn't add anything. Anyone have this problem before?