Rated 5 out of 5 stars

This addon does exactly what it claims to do, and I've been using it for years. I'm only posting this review in hopes that NijaPirateGrrl will read this. Unblocking previously permanently blocked cookies is tricky. Go to firefox's options, privacy, set that to customize to get the extended options that are otherwise hidden. Then you will see the exceptions list within the cookies section, and can remove blacklisted cookies from there. This addon integrates with firefox to have a quick and easy way to block or lock cookies, but to unblock them you have to go about it the old fashioned way. Blocking the wrong cookies can render some sites useless, as you found out, but it can also be undone. :)