Firefox reduces browser fingerprint uniqueness after large user study
Original title: Open research, stronger privacy: Making Firefox users harder to fingerprint
Protections in Firefox 145, measured with nearly 25 million users, cut unique fingerprints; a CCS 2026 paper documents the method.
Mozilla says new Firefox fingerprinting defenses, including changes shipped in Firefox 145, make more browsers look alike to tracking scripts. The work draws on a study of nearly 25 million Firefox users that simulated scripts from Fingerprint Pro, Signifyd, and Akamai. Telemetry used OHTTP and was later reduced to aggregates. Some protections are default; others start in Private Browsing and Strict Enhanced Tracking Protection.
- Screen APIs no longer reveal taskbar or dock size and position.
- Processor counts can be reported as 4 or 8 rather than the exact count.
- Image rendering, Web Audio, and Android math outputs were made more consistent.
- Individual telemetry records were deleted and only aggregate results kept.
- 1.Select Strict Enhanced Tracking Protection to enable the extra fingerprinting limits in all windows.
- Vendors
- Mozilla
- Products
- Firefox
- Organizations
- Fingerprint ProSignifydAkamai
From the original article
4 min read at blog.mozilla.orgFirefox 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 more Firefox users look alike to tracking scripts and strengthening individuals’ privacy in everyday browsing.
By Vinnl · blog.mozilla.org
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