Third-party cookies, also known as cross-site cookies, are cookies 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. The like button will set a cookie that can be read by Facebook. That would be considered a third-party (cross-site) cookie. Some advertisers use these types of cookies to track your visits to the various websites on which they advertise. This is called cross-site tracking.
Note:Cross-site tracking cookies are now disabled by default for all Firefox users. See Enhanced Tracking Protection for more information about how Firefox protects you against tracking. Cross-site tracking cookies are now disabled by default for all Firefox users. Enhanced Tracking Protection Strict mode now disables all cross-site cookies. See Enhanced Tracking Protection for more information about how Firefox protects you against tracking.When third-party cookies are disabled, it can stop some, but not all types of tracking. If you are concerned about tracking, see also:
To block cross-site trackers or all third-party (cross-site) cookies:
Firefox also blocks third-party cookies in
ETP Strict mode. This differs from blocking all third-party cookies through the custom cookie blocking settings in technical details. For more information, see
Storage AccessAPIon
MDN Web Docs.
Firefox also includes
Total Cookie Protection, which creates a “cookie jar” for every website. This feature keeps cookies in the site where they were created so that they can't track you across websites. Total Cookie protection is enabled when the
Cross-site tracking cookies, and isolate other cross-site cookiessetting is selected.
Some websites may not work properly when third-party (cross-site) cookies are blocked. To turn off Enhanced Tracking Protection for a specific website:
Follow the same process to turn Enhanced Tracking Protection back on.
If the issue persists, consider reporting it by submitting a Broken Site Report. This allows the Webcompat team to examine the problem. For more information, see How do I report a broken site in Firefox desktop?
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