Does exactly what it says. Would be even better if I could import/export lists.

Also handy to prevent (nsfw) sites from re-opening after a browser crash.

The addon is great, but the settings for Close Delay are not saved.

Easy to block sites with one click of the button. Didn't take long to figure out how to edit or remove blocked sites. I would like to see better instructions. I don't understand what regex means so I don't use it. I like that I can use wildcards so it will block a domain. Works very well for my needs.
I changed my rating to four stars because "Hand Of C'thulhu" tells me to Google the answer instead of saying thanks for your input. Signs of an arse.

I gave this add-on a 4 star. To get a 5 star, I want to see a shortcut in the context menu. That would help a lot!

Simply closes tabs or windows with blacklisted sites, with a button to add them, simple, and easy to use. I gave it four stars, because I needed a password setting so I can't disable it so easily, If you could add that, definitely 5!