The Torbutton extension in Firefox allows you to instantly turn on and off the use of Tor to anonymize your web surfing. Using Tor, you can keep websites from knowing who you are. In addition, since your traffic goes through Tor servers when you elect to use Tor in Firefox, you can get around service that block certain websites to get to places like MySpace, Friendster, and the like from work, school, the library or other places that restrict web site access.