Using the internet can be a risky business. You can leave a trail that identifies where you go, what interests you etc and there can be a legitimate requirement to surf the net annonymously. The quickest way to set this up in a easy "turn it on", "turn it off" type way is to install Tor and also install the related plugin for firefox and mozilla browsers that lets you kick this in when needed. You may find that your surfing takes a small speed hit but if you really need to protect your identity online then I guess this is a small price to pay.