How can this website reidentify me even after deleting all of my browser's history and using a VPN?

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Music by Eric Matyas
https://www.soundimage.org
Track title: Light Drops

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Chapters
00:00 Question
02:17 Accepted answer (Score 252)
04:57 Answer 2 (Score 57)
06:24 Answer 3 (Score 5)
07:29 Thank you

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Full question
https://superuser.com/questions/1250944/...

Question links:
[dropmail.me]: https://dropmail.me/en/
[Priv8]: https://addons.mozilla.org/de/firefox/ad.../

Accepted answer links:
[MDN writes]: https://developer.mozilla.org/en-US/docs...
[someone wrote]: https://web.archive.org/web/201709191350.../
[image]: https://i.stack.imgur.com/S6fJ7.png
[image]: https://i.stack.imgur.com/lDGnq.png
[the following from August 2011]: https://support.mozilla.org/en-US/questi...
[someone noted in May 2016]: https://bugzilla.mozilla.org/show_bug.cg...

Answer 2 links:
[As noted by Arjan]: https://superuser.com/a/1250955/358766
[image]: https://i.stack.imgur.com/PRITM.jpg
[image]: https://i.stack.imgur.com/3qXSS.jpg
[image]: https://i.stack.imgur.com/dO3k4.jpg
[Arjan's answer]: https://superuser.com/a/1250955/358766

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Content licensed under CC BY-SA
https://meta.stackexchange.com/help/lice...

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Tags
#firefox #browser #privacy #tracking #privatebrowsing

#avk47