How can I make sure that only the Web site that sets the cookie can read it?

I want some websites to be able to store cookies and use them, but I don't want other sites to use these same cookies.
I know how enable/allow per session/block and I have same cookie manage extensions.
What I can't find anywhere is information on who can read the cookies once they are defined.

Only website (server or domain) that sets a cookie can read this cookie, but it can be an iframe embedded with another domain that defines the so called third-party cookies.

You can disable third-party cookies.

Tags: Firefox

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