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I have been using this for a while.
it work fine.
but at some places it block all my websites in fox browser, like you tube and all.
but on other browser of mine they are able to open the websites.
i want to remove it from Mozilla Firefox browser. but i am unable to do it.
it always asks for a password in order to disable, remove it.
and i don't know which password its talking about.
and there is no option to recover my password. there is no way provided to recover my password.
please tell me a way to remove it.
i will be very thankful to you.

Это отзыв для предыдущей версии этого дополнения (3.02). 

Please read this answer:
http://forums.mozillazine.org/viewtopic.php?p=14500685#p14500685