"Verschlimmbessern" (German word concoction for "To make something worse in an attempt to improve it." Dysfunctional losing transparency and trust.
Have used it for years, always been an excellent tool. Now it no longer shows the number of cookies removed when you use it. No report or other information option. Losing trust.

Doesn't add anything anywhere to Firefox. Useless

Simply does not work...
click on the plugin, a popup says cookies are deleted, then check your cookies and they are still there.

The description sounded like just what I wanted. But even though I installed it successfully, and granted the requested permissions, clicking the icon in the toolbar did not present any confirmation notification as expected. In fact, nothing happened that I could see.