Third-party 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. 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.
Third-party cookie settings are available in the OptionsPreferences page's panel:
- Click the menu button
and select . .
- Select the
- From the drop-down next to Accept third-party cookies and site data, select Note: After browsing with this setting, you won't be able to properly view some of your favorite websites, so an intermediate solution is to set it to From visited. That will allow third-party cookies coming from previously visited websites. .
- Close the about:preferences page. Any changes you've made will automatically be saved.
Disable third-party cookies
To block third-party trackers or all third-party cookies:
- Click the Firefox menu button
and select .
- This takes you to the Content Blocking section of your Firefox OptionsPreferences panel.
- Select the Third-Party Cookies checkbox to block third-party tracking cookies. To block all third-party cookies, change the setting from Trackers (recommended) to All third-party cookies (may cause websites to break).

This takes you to the Cookies and Site Data section of Firefox OptionsPreferences, where you can change the type of cookies blocked.

- Click the Firefox menu button
and select .
This takes you to the Content Blocking section of your Firefox OptionsPreferences panel. - Select the Custom radio button to choose what to block.
- Select the Cookies checkbox. Third-party trackers is the default setting.
- To block all third-party cookies, select All third-party cookies (may cause websites to break) from the drop-down.
- Close the about:preferences page. Any changes you've made will automatically be saved.
- Click the menu button
and select . .
- Select the
- Under Enhanced Tracking Protection, select the Custom radio button to choose what to block.
- Select the Cookies checkbox. Cross-site and social media trackers is the default setting.
- To block all third-party cookies, select All third-party cookies (may cause websites to break) from the drop-down.
- Close the about:preferences page. Any changes you've made will automatically be saved.
Enable third-party cookies for specific sites
Some websites may not work properly when third-party cookies are blocked, even with the Trackers (recommended)Third-party trackers setting. To enable third-party cookies for specific websites:
Click the Control Center button in the address bar and click
For more information, see Turn Content Blocking off on individual sites.
Some websites may not work properly when third-party cookies are blocked, even with the Cross-site and social media trackers setting.
To turn off Enhanced Tracking Protection for a specific website:
- Visit the website.
- Click on the shield
to the left of the address bar.
- Toggle the switch
at the top of the panel.
- This will turn off Enhanced Tracking Protection for this site. The page will reload automatically and allow trackers on this site only.
To turn Enhanced Tracking Protection back on, follow the same process.