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You can't block all sites while whitelisting a few at the same time.
For example, I want my son to watch netflix, youtube, etc while blocking all other websites with the * code. Impossible! I had done this in 2012 with another add-on but I can't find it anymore.

Это отзыв для предыдущей версии этого дополнения (3.02). 

please send your question to forum:
http://forums.mozillazine.org/viewtopic.php?t=2954579