Useful Rated 4 out of 5 stars

Useful but be careful not to use Cookies Manager+ to delete all your cookies - it's extremely slow (100% CPU for several minutes before I gave up) - whereas Firefox's built-in function is instant.

This review is for a previous version of the add-on (1.5.1.1-signed.1-signed). 

Can't reproduce it. Just deleted over 3000 cookies in an instance with maybe 10% cpu usage.
Perhaps you have another addon that interfere?

Rated 4 out of 5 stars

Nice work. I thought there was a bug as my selection kept jumping back, until I realised it was because of auto-refresh - it should be off by default.

This review is for a previous version of the add-on (1.3.1-signed.1-signed). 

As the matter of fact, this has been changed in already submitted v1.5
It should be available in auto update in a few days or so.