Does not recognize an open firefox

I'm working with ubuntu 12.10 as OS running Firefox 16.0.1. (Zotero 3.0.8) and LibreOffice 3.6. (Zotero 3.5.3) When I push on the button "Insert Citation", I get the following error message "An error occured communicating with Zotero. Please ensure Firefox is open and try again.", but Firefox is running.
Thanks for your help.
  • try reinstalling word processor components from the "Cite" tab of the Zotero preferences. Also make sure you have a java version selected for LO as described here:
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