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A comment on Firefox 85 cracks down on supercookies. Parent comment

Re:Firefox 85 cracks down on supercookies by avolpe on Tuesday January 26, 2021 @12:54PM (#25918983)
I think that they put the user information in the image using something like this[1].

[1]. https://github.com/subc/steganography

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Re:Firefox 85 cracks down on supercookies by swznd on Tuesday January 26, 2021 @06:57PM (#25922506)
Likely, they put identifier with steganography

When image loaded, js read the identifier, if the image loaded from cache, the identifer still same

Edit: typo

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