Yep. I just confirmed it… restarting Firefox seems to make the ID in demo.supercookie.me change.
Thought as long as you keep Firefox session open the id will be the same.
I’m not sure if the links you reference are the whole story though, because they are talking about partitioning the cache per top-level domain, which I would expect wouldn’t have been enough, since the demo is specific to its top-level domain and it’s not necessarily about cross-domain id.
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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.
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Yep. I just confirmed it… restarting Firefox seems to make the ID in demo.supercookie.me change. Thought as long as you keep Firefox session open the id will be the same.
I’m not sure if the links you reference are the whole story though, because they are talking about partitioning the cache per top-level domain, which I would expect wouldn’t have been enough, since the demo is specific to its top-level domain and it’s not necessarily about cross-domain id.
makes mental note to shutdown firefox on mobile more often.