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I don't know how to use this add on. I've installed this one along with Google translate extension. When double click on any word, only the translate extension pops up. Please guide me.

Questa recensione riguarda una versione precedente (2.59) del componente aggiuntivo. 

Hello!

I have written a page explaining how to install and activate:
http://marcoagpinto.cidadevirtual.pt/en_installing.html

I hope this helps.