From ars technica:
Researchers have recently developed the first reliable technique for websites to track visitors even when they use two or more different browsers. This shatters a key defense against sites that identify visitors based on the digital fingerprint their browsers leave behind.
Fortunately, cross-browser tracking doesn’t work against people using the default installation of the Tor browser. Still, many people tweak their installations of Tor so that it supports certain WebGL graphics capabilities required by gaming sites or other online destinations. While those tweaks may make the Tor browser more usable, they may also make it less immune to the fingerprinting techniques. Cao said he’s not aware of any sites using cross-browser fingerprinting.
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