Most major websites track their visitors' behavior and then sell or provide that information to other companies. This information can be used to show ads, products or services specifically targeted to you. Firefox has a Do Not Track feature that lets you tell every website you visit, their advertisers, and 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 this feature will not affect your ability to log in to websites nor cause Firefox to forget your private information, such as the contents of shopping carts, location information or login information.
Note: You may see less relevant advertising on websites if you have the Do Not Track option activated.
How do I turn the Do-not-track feature on?
The Do-not-track feature is turned off by default. To turn it on:
Scroll and find the Settings application
Find and tap the Do Not Track in the Privacy & Security section.
Tap the circle next to Do Not TrackTell websites and apps that I do not want to be tracked.