Rated 5 out of 5 stars

Did exactly what I needed (show in real time all the key parameters of my application's cookies that I needed to monitor - the built-in Firefox (6.02) viewer is helpful but shows only the basic parameters, does not always shows the latest state of the cookie, and requires more mouse clicks to use). Saved me a lot of time. The only very minor grouch is that the option to make this add-on the default cookie manager has disappeared. Many thanks to the developer.

This review is for a previous version of the add-on (1.5.1). 

There is a hidden setting that can be used for that. In the address bar type:
about:config

then search for:
extensions.cookiesmanagerplus.alwaysusecmp

set it to "true"