Rated 5 out of 5 stars

Probably due to this bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1254752
Needs to be updated before it hits releases.
Options can't be changed, cookies can't be deleted.

This review is for a previous version of the add-on (1.8.5.1-signed.1-let-fixed). 

The next release of CK will fix this issue. It should be available soon.