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Tracking users with favicons, even in incognito mode
(github.com)
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this post was submitted on 17 Nov 2025
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Privacy
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Note that this is an issue from 2021. Firefox has implemented countermeasures since version 85, Chrome seems to have done the same.
So while this is definitely interesting, it shouldn‘t be an issue anymore.
Yep. I just confirmed it.. restarting Firefox seems to make the ID in https://demo.supercookie.me/ change. Thought as long as you keep Firefox session open the id will be the same.
makes mental note to shutdown firefox on mobile more often.