Internet Explorer has had very solid security record after IE5. ActiveX was a big mess, but it was innovative technology that even Google is trying to replicate with their embedded binaries now. It's also the reason why Microsoft spend so much time hardening IE's security. Now a days when the most attacked vector is third party software like Flash and PDF Reader, IE is almost the only browser capable of blocking these attacks. Firefox still has NO SANDBOX AT ALL. It's like having sex with a prostitute in Cambodia - when the hiv rate is almost 20% among the sex workers, only an idiot would have sex without a condom.