This article discusses a tracking method called "supercookie" that uses favicons to create unique identifiers for website visitors. Unlike traditional tracking, this method persists even in incognito mode and cannot be easily cleared by users. It highlights the potential for tracking across major browsers and suggests disabling the favicon cache as a mitigation strategy.

Mozilla is rolling out improved anti-fingerprinting measures in Firefox 145, initially available in Private Browsing Mode and Enhanced Tracking Protection Strict mode. These updates aim to reduce the number of users who can be uniquely tracked online, now down to 20% by blocking various identifiers while balancing usability for legitimate sites.