Disable third-party cookies in Firefox to stop some types of tracking by advertisers

Revision Information
  • Revision id: 24049
  • Created:
  • Creator: Verdi
  • Comment: made change to intro to clarify that third-party cookies are not set by the website you are visiting.
  • Reviewed: Yes
  • Reviewed:
  • Reviewed by: Verdi
  • Is approved? Yes
  • Is current revision? No
  • Ready for localization: Yes
  • Readied for localization:
  • Readied for localization by: Verdi
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Revision Content

Third-party cookies are cookies that are set by a website other than the one you are currently on. For example, cnn.com might have a Facebook like button on their site. That like button will set a cookie that can be read by Facebook. That would be considered a third-party cookie.

Some advertisers use these types of cookies to track your visits to the various websites on which they advertise. If you are concerned about this, you can disable third-party cookies in Firefox.

Note:
  • If you are concerned about tracking by advertisers, see also How do I turn on the Do Not Track feature?.
  • Disabling third-party cookies in Firefox can stop some types of tracking by advertisers, but not all.
  • Some websites (e.g. Microsoft's Hotmail, MSN, and Windows Live Mail webmail) use third-party cookies for purposes that are not necessarily privacy concerns, and disabling third-party cookies may cause problems with those sites.


Third-party cookie settings are available in the OptionsPreferences window's Privacy panel:

  1. Click the menu button New Fx Menu and choose Options.Preferences.
  2. Select the Privacy panel.

  3. Set Firefox will: to Use custom settings for history.
    customhistory38
  4. Uncheck Accept third-party cookies. Disabling Third Party Cookies - Fx5 Win

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  5. Close the about:preferences page. Any changes you've made will automatically be saved. .