Almost perfect Rated 4 out of 5 stars
This works really well as a replacement for the now abandoned CSLite/CookieSafe, but a couple of tweaks are needed. First, it really needs an easy way to switch between the default action of block or allow all, OR a "Temporarily allow all" as there is no way to do this at present from the statusbar icon (you have to go to FF addons tab and go into the extensions options).
One smaller niggle is the statusbar icon itself, it really needs changing to a simple intuitive red/green, tick/cross icon.
Fix the first issue and it will be the best cookie manager currently maintained for FF. Fix the second as well and spectre of CookieSafe will be long forgotten ;-)