and I use donottrack to stop the tracking crap that so many sites have. It gives you an email which forwards onto your real email (if you want), so you don't have to sign up to sites using your real email.
Last thing I use is HTTPS everywhere - it forces you to try https automatically instead of http where applicable.
I never had much luck with adblock. Maybe it was a firefox thing, allthough it seemed to work for others.
Just don't open any wierd emails or go to porn sites
