How to Enable 'Do not Track' Setting in Firefox

Firefox 5 has new feature called 'Do not track'. This feature makes sure that sites stop tracking you. Browser initiates a signal that says' do not track'. By enabling this setting your browser and other personal data is not accessible for marketing and advertising purpose. This is to support behavioral advertising rather than personal/geo targeted advertising. 

You can make the settings as shown in this image. Just check the 'tell website' option for do not track. Another choice which is optional and is supposed to be used only on your own wish. You can enable permanent private browsing mode, this way you'll have new session every time with no cookies tracking.

This feature plus duckduckgo will make your browsing experience more safe and secure.