Prevent duplications from Zotero browser add-on

Hi, many thanks for providing and maintaining Zotero.
The current add-on is great to store references. However, I usually end up with duplicate entries which I can merge using the stand-alone application. Could the add-on notify or show that a document is already on the user bibliography?
This would help me to avoid storing twice the same manuscript and know if I already found it.
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