Why do cookies still show up in Cookies list? Rated 3 out of 5 stars

I see all the notifications indicating that trackers and cookies are being destroyed, but when I go through Firefox's settings to the Cookies list, I still see the cookies. For example, mail.google.com, accounts.google.com, and google.com are all present even after I close all the relevant tabs.

This review is for a previous version of the add-on (0.4.0.1.1-signed).