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When Trying to install I received the following message: Firefox could not install the search plugin from "https://addons.mozilla.org/en-US/firefox/downloads/latest/48587/addon-48587-latest.xml?src=addondetail" because an engine with the same name already exists.

the star rating in no way reflects the quality of this add on since I could not install it to try it

Questa recensione riguarda una versione precedente (20091218) del componente aggiuntivo. 

The error is not due to my plugin. If you read the error message firefox is trying to tell you that you already have it installed.