Which browser is the safest from virus?

Well no browser will be 100% safe and really if you don't want to get any viruses you can disable the auto running of Java and Flash. Also be careful where you download things as well as what you download. Make sure you trust the source that you are downloading from. Oh and I would say the only browser to stay away from is Internet Explorer as that Browser is an virus attracter it will practically give your computer viruses from you running it. It allows for websites to access your desktop and OS from the browser because if you are on an Windows platform internet explorer is your desktop.

I agree with dupremo, i can't say any browser 100% safe but in my till date experience Firefox 3 has been remained the best because of three reasons. The first, i seems highly secure to me, second it quickly loads almost every sites and other web-hosted services and third it is infinitely expandable. Additionally, it better solves memory leak problem.