The browser shields several high-risk telemetry points by standardizing mathematical operations on Android, image rendering, and Web Audio outputs. System resolution reporting has also been modified to conceal taskbar dimensions, while processor counts are now reported as either 4 or 8 instead of exact figures. During the research stage, engineers used OHTTP relays to decouple IP addresses from incoming telemetry and deleted individual records to protect participant privacy. The resulting mitigations, including updates shipped in version 145, will be formally presented at the CCS 2026 conference.
Key points
Standardization across Web Audio, image rendering, and hardware signals prevents trackers…: Standardization across Web Audio, image rendering, and hardware signals prevents trackers from isolating individual users.
Large-scale telemetry gathered from 25 million participants was reduced to aggregate data…: Large-scale telemetry gathered from 25 million participants was reduced to aggregate data after individual records were deleted.
Research supporting these protections has been accepted for publication at the upcoming C…: Research supporting these protections has been accepted for publication at the upcoming CCS 2026 conference.
Sources checked by our analysis pipeline: 1
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 more Firefox users look alike to tracking scripts and strengthening individuals’ privacy in everyday browsing.
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.
Cookie-less Tracking
Browser fingerprinting combines details about your browser and device, such…
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