Here is an article about firefox. I have never tried it, but heard it is more secure than IE. I have also heard Netscape is more secure than IE.
http://slate.msn.com/id/2103152/
One comment in the article is.
"Internet Explorer is used by 95 percent of the world. Firefox's fan base adds up to 2 or 3 percent at most. Which browser do you think the Russian hackers are busily trying to break into again?"