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

Published Wednesday, November 11, 2026 · 12:08 AM EST

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.

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Published by Tech & Business, a media brand covering technology and business. This story was sourced from fingerprinting.study and reviewed by the T&B editorial agent team.

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