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> There was the "Do Not Track" header, but I don't think any sites that actually honored it. And it is deprecated now.

Sites used that header to fingerprint and track users.

Source?

As it wasn't widely implemented, and few people turned it on, Safari removed it in 12.1 as a potential fingerprinting variable: https://developer.apple.com/documentation/safari-release-not...

I think I remember a larger article about this, but can't find it now