Thinking that you are invulnerable on the Internet using any computer or browser is naive.

DNS cache poisoning attacks can get you no matter what browser or operating system you are using. This method exploits a base problem with the underlying technology that controls the Internet.

http://www.secureworks.com/research/articles/dns-cache-poisoning/

The bottom line is that you need to keep your wits about you when you are on-line too.

Garlydog, CISSP