[luchs]

This is exactly what the "block third-party cookies" option does. It really should be enabled per default, possibly with a permission prompt for cases where they are useful.

The interesting thing here is that third-party cookies usually allow a central site (e.g. an ad server) to track a user across many other sites. It's almost the other way around here: "other sites" can track status on a "central site".

[amelius]

I didn't know this option exists. Thanks. I enabled the option and indeed, this social media fingerprint stopped working :)