I dunno... "Periodically changing user agent" sounds pretty unique if you ask me. Especially if the extension isn't super-clever and changes the user agent for

I dunno... "Periodically changing user agent" sounds pretty unique if you ask me. Especially if the extension isn't super-clever and changes the user agent for accesses that happen on the same page. And the fingerprinter could be super clever and look for features that your purported browser isn't supposed to support... And if your browser does support them, that's a strong identifier.