Firefox was majorly hit by hackers yet again which is the third major incident since it's release. Greasemonkey which is an addon for Firefox that provides similar capabilities as Active X does for Internet Explorer was found to have a major security flaw. Malicious websites were able to access and read files on peoples home pc's. See Press Report below.
http://news.yahoo.com/news?tmpl=stor...pcworld/121918
Firefox was touted to be the better alternative to Internet Explorer as it was deemed to be more secure. However recent attacks including the theft of user information stored on the Spread Firefox marketing site, and a Firefox update that broke many third-party extensions have just shown that it is as vunerable as Internet Explorer.
So what should you use Internet Explorer or Firefox?