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Hi, there is an incompatibility between Feedly and the use of Zotero (another Firefox extension http://www.zotero.org/. Zotero help to collect research sources, and can import bibliographic references from a lot of catalogs and commercial sites).
When Feedly is activated, Zotero can't import book references from the "Sudoc" .(http://www.sudoc.abes.fr/)