Rated 5 out of 5 stars
I've been using this for a while, but since I just made an account here I wanted to give it a review.
And it's been doing what it's supposed to be doing. I've avoided "Don't allow sites ... to set future cookies" option because of the comments here, though. I don't like irreversible actions.
I've found a nice companion for this addon in Cookie Monster. I mainly just use it to set "Block 3rd Party Cookies". That way it keeps out most of the cookies I never want, while allowing me to login to sites I occasionally use. Then CookieCuller cleans up the list each time I restart Firefox, without removing my regular sites.