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

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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 (for instance, 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 PrivacyPrivacy & Security panel and go to the History section.

  3. In the drop-down menu next to Firefox will: choose Use custom settings for history.
    customhistory38 Fx56Privacy&Security-CustomHistory
  4. Uncheck Accept third-party cookies. Disabling Third Party Cookies - Fx5 Win

    c8b33ebc986c4f8bdd09c086906a0eac-1258149074-703-1.png
  5. Close the about:preferences page. Any changes you've made will automatically be saved.
  1. Click the menu button New Fx Menu and choose Options.Preferences.

  2. Select the PrivacyPrivacy & Security panel and go to the History section.

  3. In the drop-down menu next to Firefox will: choose Use custom settings for history.
    customhistory38 Fx56Privacy&Security-CustomHistory
  4. Uncheck Accept third-party cookies. 3rd Party Cookies Fx21 WinXP 3rd Party Cookies Fx21 Win7 3rd Party Cookies Fx21 Mac 3rd Party Cookies Fx21 Linux
  5. Close the about:preferences page. Any changes you've made will automatically be saved.
  1. Click the menu button New Fx Menu and choose Options.Preferences.

  2. Select the PrivacyPrivacy & Security panel and go to the History section.

  3. In the drop-down menu next to Firefox will: choose Use custom settings for history.
    customhistory38 Fx56Privacy&Security-CustomHistory
  4. Set Accept third-party cookies to Never.

    3rd Party Cookies Fx22 Win7
    Note: If after browsing with this setting, you realize you can't view properly some of your favorite websites, an intermediate solution is to set it to From Visited that allow third-party cookies coming from previously visited websites.
  5. Close the about:preferences page. Any changes you've made will automatically be saved.
  1. Click the menu button New Fx Menu and choose Options.Preferences.

  2. Select the PrivacyPrivacy & Security panel and go to the History section.

  3. In the drop-down menu next to Firefox will: choose Use custom settings for history.
    customhistory38 Fx56Privacy&Security-CustomHistory
  4. Set Accept third-party cookies to Never.

    Privacy - Accept third-party cookies - Never 38
    Note: If after browsing with this setting, you realize you can't view properly some of your favorite websites, an intermediate solution is to set it to From Visited that allow third-party cookies coming from previously visited websites.
  5. Close the about:preferences page. Any changes you've made will automatically be saved.

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