Firefox already has built-in tracking protection that blocks social media trackers, cross-site cookies and more. On the "Enhanced Tracking Protection" section o

Firefox already has built-in tracking protection that blocks social media trackers, cross-site cookies and more. On the "Enhanced Tracking Protection" section on the "Privacy & Security" preferences page, select the "Strict" setting. (They don't make this the default because they want people to be aware that it could break certain sites.) There's a "Learn more" link there with more information: https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop https://support.mozilla.org/en-US/kb/enhanced-tracking-prote... I confirmed that the Strict mode blocks connections to connect.facebook.net, googletagservices.com and others.