Large-Scale Measurement and Real-World Mitigation of Web Browser Fingerprinting in the Wild

Mozilla researchers conducted a large-scale study of browser fingerprinting using telemetry from nearly 25 million Firefox release users to measure uniqueness and identify contributing characteristics. The analysis revealed that fingerprintability is driven by a small set of high-impact metrics rather than the accumulation of numerous independent measurements. Based on these insights, the team designed and shipped data-driven protections in Firefox 143 that reduce the fraction of uniquely identifiable users from 75% to 46% while maintaining web compatibility. Open article →