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I installed it because it claims to be able to modify shortcuts. I tried a few times to assign <ctrl>w to close the current tab but nothing changed. I did not give one star because I did not test the other features that it claims to have.

Ta opinia jest o wcześniejszej wersji dodatku (5.08). 

Please send request about your problem to forums mozillaZine:
http://forums.mozillazine.org/viewtopic.php?t=2828771