# Mozilla study finds Firefox protections cut browser uniqueness from 75% to 46%

_Published Wednesday, November 11, 2026 at 12:08 AM EST · Security · Latest · Tier 2 — Notable_

Mozilla researchers report that fingerprinting protections shipped in Firefox 143 reduced the share of uniquely identifiable browsers from 75% to 46% while maintaining web compatibility. Their study used telemetry from almost 25 million Firefox release users to identify which browser characteristics most enabled tracking.

A small combination of measurements drove much of the uniqueness. The researchers released aggregate data, analysis code and a browser test that compares measurements locally without submitting them. They caution that protection effectiveness varies substantially by operating system and that standardizing browser characteristics alone cannot protect every user.

## Sources

- [fingerprinting.study](https://fingerprinting.study/)

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Canonical: https://techandbusiness.org/newswire/mQHtHRRdBB4jmiCmJ_hWBv
Published: 2026-11-11T05:08:42.904Z
Story chronology: 2026-11-10T19:03:54.000Z
Retrieved: 2026-11-11T06:49:59.381Z
Publisher: Tech & Business (techandbusiness.org)