A comprehensive study of how fingerprintable users are

Mozilla conducted a large-scale study using data from nearly 25 million Firefox users to measure how effectively browsers can be fingerprinted for tracking purposes and found that a small set of high-impact characteristics drive most uniqueness. The research identified which browser attributes make users identifiable and led to the development of fingerprinting protections shipped in Firefox 143 that reduce uniquely identifiable users from 75% to 46% while maintaining web compatibility. The study demonstrates that practical reductions in browser fingerprinting are achievable in mainstream browsers using privacy-preserving measurement technologies.