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> […] but being able to read pixel data out of a canvas is completely reasonable.

Not for every website. Most websites don't need canvas at all. One option would be to ask users to activate canvas support for a website that does need it, so users can judge for themselves if the request is legitimate. This is how the geo-location API works after all.

I am not convinced that this will work very well though.



Seems like just another vector to fingerprint that browser by :)


It is! But a disabled setting has a much lower entropy in terms of identifying bits than the hash generated with an active canvas.




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