If you want to get rid of all cookies, click on the Remove All button. However, you also have the option of removing individual cookies. To do this, locate the cookie you want to delete and select it in the list. Note that when you select an individual cookie, details about that cookie will be shown in the lower portion of the window. Click the Remove button to delete that particular cookie.
You can also delete all of the cookies related to a specific website by selecting that website's folder and then clicking Remove. If you choose to go this route, it's a good idea to browse through the entire list of cookies and look for sub-sites or alternate names for the web site. For instance, in the screenshot above, there are folders for mozilla.com, mozilla.org, addons.mozilla.org, and so on.
Step 4: When done, click Close to close the Permissions window and then Close again to exit the Options window and return to the main browser.