firefox connector for Zotero 3.0.13 standalone in Xubuntu 12.04.1

Yesterday I installed Zotero 3.0.13 according to apt-get sequence in
http://forums.zotero.org/discussion/25317/install-zotero-standalone-from-ubuntu-linux-mint-ppa/#Item_1

This morning, Zotero's save-icon is not visible in http location-bar for sites that always show the save icon (eg, books.google.com).

How do I install Zotero's Firefox connector for 3.0.13 standalone in computer running Xubuntu 12.04.1?
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