Cookies store login sessions, preferences and tracking identifiers, so an extension that can read or delete them has meaningful access to your accounts. This permission appears in cookie managers, multi-account tools and privacy cleaners, and it is worth understanding exactly what it exposes.
What the cookies permission allows
An extension with this permission can read, set and delete cookies for websites, and can inspect cookie values such as session identifiers, depending on the site. This can effectively let it access an active login session on a site if the extension is designed to do so.
Which extensions legitimately need it
Cookie editors, multi-account container tools, session managers and cache or cookie cleaners typically need this permission because their entire function depends on reading or clearing cookie data. A general-purpose extension with no cookie-related feature has little reason to request it.
How to check or remove the cookies permission
Open chrome://extensions, click Details on the extension to view its permissions. Chrome does not let you disable just the cookies permission while keeping the extension enabled, so removing the extension from Manage extensions is how you revoke this access.