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Firefox 4 and higher has a feature to inform websites not to track you across the web. You can turn this feature on by selecting "Tell web sites I do not want to be tracked" in the Firefox options window. This article describes what tracking is and how this feature works.

Most major websites track their visitors' behavior and then sell or provide that information to other companies (like advertisers). Firefox has a '''Do-not-track''' feature that lets you tell websites you don't want your browsing behavior tracked. This article explains what tracking is, how the Do-not-track feature works and how to turn it on. [[Template:Only in Fx4]] __TOC__ =What is tracking?= Tracking is a term that includes many different methods that websites, advertisers and others use to learn about your web browsing behavior. This includes information about what sites you visit, things you like, dislike and purchase. They often use this information to show ads, products or services specifically targeted to you. =How does the Do-not-track feature work?= When you turn on the Do-not-track feature, Firefox tells every website you visit (as well as their advertisers and other content providers) that you don't want your browsing behavior tracked. Honoring this setting is voluntary — individual websites are not required to respect it. Websites that do honor this setting should automatically stop tracking your behavior without any further action from you. Turning on Do-not-track will not affect your ability to log into websites nor cause Firefox to forget your private information — such as the contents of shopping carts, location information or login information. {note}'''Note:''' You may see less relevant advertising on websites if you have the Do-not-track option activated.{/note} =How do I turn the Do-not-track feature on?= The Do-not-track feature is turned off by default. To turn it on: #[[T:OptionsPreferences]]. #Select the {menu Advanced} panel. #Click the {menu General} tab.{for win}<br><br>[[Image:Options window - Advanced panel - Do not track]]{/for} #Check '''Tell websites I do not want to be tracked'''. #[[T:CloseOptionsPreferences]]