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A web page that shows you everything the browser told it without asking
(sinceyouarrived.world)
This is a most excellent place for technology news and articles.
Yes. You can either give them your real one, or not. That's the point being made. Actually the point of the whole page is that just loading a website tells a huge amount about you, even if you are behind a vpn and extensions to minimize your fingerprint. You are a product for sale.