CritterNYC - 3:15 pm on Jul 14, 2004 (gmt 0)

Take for example this FF vulnerability [webmasterworld.com]. Although IE has far more vulnerabilities in the past 12 months it is also used 20 times more often, so I assume it is a 20 times more attractive target, hence hackers will invest 20 times more energy into finding and exploiting new vulnerabilities.

You mean the one that has already been patched and is actually a vulnerability within Windows that Internet Explorer, MSN Messenger and MS Word were also vulnerable to?

Your 20 times argument is specious. It would be more accurate to say that if there are 1 million compromised IE installations, there should be 50,000 compromised Firefox installations. I've seen lots of compromised IE installations... no Firefox ones, despite the fact that Firefox *IS* being targetted by malware and spyware authors. The Mozilla folks are being proactive in dealing with it.