Firefox is best, and Opera is second best it's just a pity it lacks a decent addon system. Actually IE8 is now a fairly secure browser, although i don't like it much. As for Chrome, how can anyone put that rubbish on their machine. Some people have no common sense, i guess that's why there is millions of machines infected with malware. People will blindly run anything.
Use Mozilla. Maybe chrome is fastest than mozilla with 0,000001 sec but for mozilla there's tons of addons and it can also be tweaked to make it the fastest.
Currently I am using Firefox as my default browser, it works fine for me If it is convenient for you, you should go for it, hope this helps.
My browser of choice is usually Opera. Chrome is too new, and presents itself to be more of a keylogger than anything else .. No keyloggers allowed. For development purposes I'll use IEX7 and FF, both stripped down (no add-ons), equally.
IF Chrome would have the extension support like firefox would be the best browser. Now i'm using mozilla...i'm using it for 3 years and no problem since now .