How can I detect what cookies a web pages uses?

I want to know the cookies a web page uses and whether they use cookies placed on the computer by other websites.

Is there a way of knowing this or even an addon for it?

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whether they use cookies placed on the computer by other websites.

It should not happen on Firefox because of First Party Isolation. Basically it puts all the cookies created by a domain inside a virtual jar and makes the jar inaccessible by other domains.