Firefox Just Killed Browser Fingerprinting (2025)

Firefox 145 introduces enhanced anti-fingerprinting protections that reduce uniquely identifiable users from 65% to 20%. The new defenses block tracking through hardware details, fonts, processor cores, and screen dimensions. Initially available in private browsing and strict mode, these protections will eventually be enabled by default for all users. Fingerprinting allows websites to track users even when cookies are blocked by creating unique digital signatures from browser and device characteristics.