It DOES work, if... Rated 5 out of 5 stars

It DOES work, if(!) you follow the instructions at the bottom of the download page (http://netticat.ath.cx/MyAddons/MyAddons.htm):
>> Important: Addon installations need script & cookies enabled <<
And if you would like to know why scripts and cookies are needed, just read the explanation from the author himself:
http://netticat.ath.cx/forum/viewtopic.php?id=5?id=5?id=5