Saving the day Rated 5 out of 5 stars
I have seen this addon some time ago and decided to test it. Oh, what a lucky day. I used to lose almost entire days in addictive sites that I not even liked. Geez, there are those sites where I just visit to become angrier! Now I've put them all in the black list and I have time again!
I believed I would just cheat and remove the sites from the blacklist, but it does not happen. Sometimes it is just a reflex, a knee-jerk Control+T and quick lookup in the history to access some leech. Leechblock give me the time to reflect about it.
It is great too because I can even add exceptions to the rules, which is important for some sites (e.g. I do not want to see my Twitter timeline but I'd like to share some link, so I enable the sharing URL).
Summing up: IT WORKS! (Or at least worked to me). Try it!