Mozilla measured which browser details actually make people unique, using data from about 25 million Firefox users (sent through an OHTTP relay so Mozilla never saw IPs with the contents). Protecting just a handful of features badly hurt scripts like Fingerprint Pro, Signifyd and Akamai. Examples: hiding your taskbar or dock size from screen APIs, reporting CPU cores as 4 or 8 instead of the exact count, and making canvas, Web Audio and Android math output more consistent. The latest pieces shipped in Firefox 145, some only in Private Browsing or Strict tracking protection for now. The paper is going to CCS 2026.
Anyone here actually run Strict mode day to day, or does it break too much?
Pretty cool work! I didn't realize some of this data was even available to a browser. Don't go looking at bitcoin wallet fingerprinting because it's kind of a mess how many details about your wallet are leaked just in constructing a simple on-chain transaction. We could probably stand to learn a thing or two from Mozilla's efforts tbh.