A security researcher has discovered a vulnerability that allows websites to track users across a number of different desktop browsers — including Apple Safari, Google Chrome, Microsoft Edge, Mozilla Firefox and Tor — posing a threat to cross-browser anonymity. Called “scheme flooding,” the flaw “allows websites to identify users reliably across different desktop browsers and link their identities together,” Konstantin Darutkin, a researcher and developer at FingerprintJS, said in a blog post published Thursday.

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