Do Not Track is a movement from privacy advocates that's gained momentum with some software companies. In essence a DNT setting tells websites that you do not want them monitoring your surfing habits.
Do Not Track in Firefox
In Firefox, DNT is turned on via the Tools tab, then Options. Click the Privacy tab and check the box saying Tell websites I do not want to be tracked.
Do Not Track in Internet Explorer
In Internet Explorer, click the gear-shaped Tools button, then click Tracking Protection. Click Tracking Protection List, then click the Enable button.
Do Not Track in Chrome
Chrome has recently added a similar tool. From the menu, select Settings and at the bottom of the page is a Show advanced settings link. Click this and then the box saying Send a Do Not Track request with your browsing traffic.
Although not all companies respect Do Not Track consumer choices, anti-virus firm AVG, for example, has built DNT technologies into its latest software and flags sites that are tracking you even though controls are turned on.