Oh, this is a big browsersecurity thread?
My 2 eurocents on the issue:
The safest browser: Elinks in the newest version. No features, no problems.
The best browser for those, who are chronically low on RAM but not desperate enough for a textbrowser: dillo. The little browser runs fine on my ancient craptop.
The best browser for those, who want features: Konqueror. It is very well integrated with everything in KDE. much better than IE in Windows.
Opera might be okay, but it is... strange to use, I never got to like the interface.
If you want FF, better get Kazehakase. It renders pages as well, but has not such a clumsy interface.