View source for Privacy.donottrackheader.value

{{preference|pref=privacy.donottrackheader.value}}

==Background==
The “Do Not Track” feature is a mechanism that allows to communicate a user's  tracking preferences to websites. [[User tracking]] is performed by websites, including advertisers and analytics services as well as social sites, to gather information about the user's web browsing pattern. This includes the history of sites visited along with preferences stated and purchases made. Such sites often use this information to show advertisements for products or services specifically targeted based on the user's profile. See [[#External links|External links]] below for further reading.

==Possible values and their effects==

===0===
A header stating ''consent'' to being tracked is sent to all websites if [[privacy.donottrackheader.enabled]] is set True.

===1===
A header stating the request ''not'' to be tracked is sent to all websites if [[privacy.donottrackheader.enabled]] is set True. (Default)

==Caveats==
* This preference does not have any effect if [[privacy.donottrackheader.enabled]] is False.
* Websites are not obligated to honor the request.

==UI==
===Mozilla Firefox===
This setting is located in [[Menu differences in Windows, Linux, and Mac|Tools &rarr; Options]] &rarr; Privacy:
* The value is 1 when “Tell sites that I do not want to be tracked” is selected.
* The value is 0 when “Tell sites that I want to be tracked” is selected.
* It can be either when “Do not tell sites anything about my tracking preferences” is selected.

===SeaMonkey===
This setting is located in the [[Menu differences in Windows, Linux, and Mac|Edit &rarr; Preferences]] &rarr; Privacy &amp; Security main tab:
* The value is 1 when “I do not want to be tracked” is selected.
* The value is 0 when “I consent to being tracked” is selected.

==First checked in==
[http://hg.mozilla.org/mozilla-central/rev/a26f703d6be8 2013-01-28 by Sid Stamm]

==Has an effect in==
* Mozilla Firefox (nightly builds since 2013-01-29; 21.0a1 and later)
* SeaMonkey  (nightly builds since  2013-01-29; 2.18a1 and later)

==Related bugs==
* [https://bugzilla.mozilla.org/show_bug.cgi?id=628197 Bug 628197 - Implement do-not-track HTTP header ]
* [https://bugzilla.mozilla.org/show_bug.cgi?id=765398 Bug 765398 - Implement three-state UI for DNT (do not track me, okay to track me, decline to state)]
* [https://bugzilla.mozilla.org/show_bug.cgi?id=835134 Bug 835134 - Modify Privacy & Security Preferences UI to reflect recent backend additions]

==Related preferences==
* [[privacy.donottrackheader.enabled]]

==See also==
* [[User tracking]]

==External links==
* [http://www.mozilla.org/dnt Do Not Track FAQ - Mozilla]
* [http://support.mozilla.org/en-US/kb/how-do-i-turn-do-not-track-feature Firefox Support Page - Mozilla]
* [http://donottrack.us/ Do Not Track Universal Web Tracking Opt Out - Project Website]

[[Category:Preferences]]
[[Category:Security and privacy-related preferences]]