Mozilla firefox is the best browser in terms of privacy, security and also is very useful in SEO as there are a lot of addons available that saves a lot of time.
Chrome is currently my favorite. Firefox and Safari are good too..
JUST USE ANYTHING EXCEPT INTERNET EXPLORER.. IE is the worst, and drives me nuts!
To maximize my SEO strategy, i used IE, Firefox and Chrome. Thats depend on the type of surfing i am doing. My primary browser is Chrome because of the speed but for the security sensitive site i used Firefox.