Open research, stronger privacy: Making Firefox users harder to fingerprint
Firefox is strengthening protection against trackers that recognize you across websites, even when they don’t use cookies. The latest fingerprinting protections shipped in Firefox reduce the extractable distinguishing details, making ...
Mozilla published research on browser fingerprinting, revealing that protecting specific features significantly reduces user identifiability. The study analyzed data from nearly 25 million Firefox users to develop practical privacy protections for the browser.
Research was accepted for publication at the Computer and Communications Security (CCS) 2026 conference.
Data from nearly 25 million Firefox users was analyzed using simulated measurements from Fingerprint Pro, Signifyd, and Akamai.
OHTTP was used to route encrypted requests through a relay, separating IP addresses from request contents.
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These protections build on our research into browser and device fingerprinting, a technique that combines details about your browser and device to identify you across websites. We investigated which details contribute most to make users uniquely identifiable, turned those findings into practical protections for Firefox users, and shared our results openly so the wider web security and privacy community can build stronger defenses.
Our findings are documented in the research paper Large-Scale Measurement and Real-World Mitigation of Web Browser Fingerprinting in the Wild, which has been accepted for publication at Computer and Communications Security (CCS) 2026, a leading international conference on computer security and privacy. We’ve also created an easier-to-digest website and browser test suite to help explore the findings in the paper.
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