Two problems using Cookie 6.7.4

[coaster]

First problem:
"Remove Firefox Non-Favorites" fails to get rid of some cookies:

• i.e.1 cookie, if "Never remove Browser Extensions" is checked
• i.e. 2 cookies, if "Never remove Browser Extensions" is unchecked
  no matter how many times I use "Remove Firefox Unwanted Data" and "Remove Firefox Non-Favorites".

Second problem:
I cannot see what are these non-removable cookies in the main window

Thanks