DNT Signal

Summary

• A site that embeds third-party content could force it to honor DNT by suppressing that content when DNT is enabled.
• Web sites should be able to check if "do-not-track" (DNT) is turned on without needing access to the HTTP stream.
• A navigator.doNotTrack object in the JS global namespace could signal that DNT is enabled, and its value would match what is sent in the HTTP header.

• This feature is targeted for Firefox 9.0.

Reference

• Feature wiki page

Use Cases

• Verify navigator.doNotTrack and the privacy.donottrackheader.enabled pref after checking the "Tell websites I do not want to be tracked" Privacy option in Tools->Options (Edit->Preferences).
• Verify navigator.doNotTrack and the privacy.donottrackheader.enabled pref after unchecking the "Tell websites I do not want to be tracked" Privacy option in Tools->Options (Edit->Preferences).
• Verify navigator.doNotTrack and the privacy.donottrackheader.enabled pref before the user checks the "Tell websites I do not want to be tracked" Privacy option in Tools->Options (Edit->Preferences) for the first time.
• Verify navigator.doNotTrack after resetting the privacy.donottrackheader.enabled Privacy option.
• navigator.doNotTrack reflects the changes of privacy.donottrackheader.enabled.

Test Cases

• Test cases for this feature can be viewed here.
• Automated tests: dom/tests/mochitest/general/test_bug629535.html.

Important Bugs

• 629535 - add do-not-track signal to navigator global object

Not Tested

• Other preferences.
• Other options of the navigator global object.
• Websites actions after checking the navigator.doNotTrack value.

Sign off Criteria

• All the test cases were run on the Firefox version the feature is targeted for (Firefox 9.0).
• All the major bugs have been fixed.