Firefox Makes Users Harder To Fingerprint

Mozilla’s strongest move is treating anti-fingerprinting as an empirical engineering problem rather than a collection of privacy toggles. The gains are meaningful, but trackers will continue adapting.

• –The study found that a small set of signals drives most fingerprint uniqueness, enabling targeted mitigations.
• –Firefox standardizes details such as screen dimensions and processor counts while preserving functionality-critical data like language and timezone.
• –Protections shipped across Firefox 143 and 145, with some enabled by default and others limited to Private Browsing or Strict ETP.
• –Mozilla used OHTTP, restricted access, deleted individual records, and published only aggregate data and analysis code.
• –Developers should test privacy changes against real-world compatibility, since aggressive fingerprint resistance can break legitimate web features.