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Supercookie uses favicons to assign a unique identifier to website visitors. Unlike traditional tracking methods, this ID can be stored almost persistently and cannot be easily cleared by the user.

github.com/jonasstrehle/superc

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@flow At least in Firefox 85.0.1 Desktop and 85.1.1 Android (when I tested) clearing the cache also nukes the favicons as well.

Also, I get different hashes when I test on demo.supercookie.me after clearing my cache on mobile, and also across Private windows on desktop.

The statement "[...] even in the browser's incognito mode and is not cleared by flushing the cache, closing the browser [...]" is misleading, at least where Firefox[0] is concerned.

[0] blog.mozilla.org/security/2021

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