OpenOffice.org Extension 3.0a7 does not work with OOo 3.2 on Leopard

The plugin installs fine, but buttons show up in OOo, but they don't work. Trying to insert a citation I get this error:

Firefox konnte die zur Kommunikation mit Ihrer Textverarbeitung notwendige Komponente nicht laden. Bitte stellen Sie sicher, dass Sie die korrekte Firefox-Erweiterung installiert haben, und versuchen Sie es dann erneut.

Translation:
Firefox could not load the component to communicate with your text editor… look if you installed the right one and try again.

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