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Can a domain read a cookie if it is blocked?

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If I block a certain domain from setting cookies, can that domain read already set cookies. And if it can, can it change its content and preferences.

If I block a certain domain from setting cookies, can that domain read already set cookies. And if it can, can it change its content and preferences.

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They are blocked from being saved or added. As far as I understand, this is not possible unless it is malware.

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Note that if you change the block/allow cookie settings then you need to clear involved cookies because existing cookies are not affected AFAIK.