Firefox more secure than IE.. BUT Microsoft can mess with it!
Joran: Normally I don't post these kinda things here but in the name of computer security, please read if you're using FireFox. Microsfot DID install stuffs into our FireFox *without our knowledge*.
in May: http://voices.washingtonpost.com/securityfix/2009/05/microsoft_update_quietly_insta.html
in Oct: http://www.downloadsquad.com/2009/10/17/dear-microsoft-please-keep-your-lousy-mitts-off-my-firefox-inst/