Hey Su, in general, when in privacy mode , you're shielded from third-party cookies and content trackers. Our anti-tracking policy reflects our commitment to protecting your privacy and keeping you secure. Firefox also has Enhanced Tracking Protection, which prevents hidden trackers from collecting your data across multiple sites and slowing down your browsing. You can read more about it here: https://support.mozilla.org/en-US/kb/private-browsing-use-firefox-without-history