Cookie editor extensions, sometimes searched as edit this cookie or edit this cookies, give you a table view of a site's cookies where you can change values, expiry dates or flags directly. They matter most for developers testing login states, QA teams reproducing bugs, and anyone who wants to see exactly what a site is storing about their session.
What a cookie editor extension shows you
A cookie editor typically lists every cookie for the current site: its name, value, domain, expiry date and flags like Secure or HttpOnly. Better ones let you edit a value in place, add a new cookie manually, or export the full set as JSON so you can restore a session later. Basic viewers only let you delete cookies, which limits their use for testing.
Editing or deleting a single cookie
If you need to change one session value or remove a single tracking cookie without wiping your login, use an extension that edits individual cookies rather than clearing everything at once. This matters for developers swapping test accounts and for anyone who wants to stay logged in while removing one unwanted cookie.
Permissions a cookie manager needs
A cookie manager needs Chrome's cookies permission and usually access to the current site to read and write its cookies. Be cautious of any extension that also asks for access to all websites or your browsing history, since a cookie editor doing its job correctly does not need either of those to function.