PDF's save on double click instead of open

I am using Zotero 3.0.1 on Firefox 9.0.1 on Mac OS X (snow leopard).

It has been working great but now I can no longer open PDF's by double clicking. Instead I get a 'save as' type dialog, with the title:
"Enter name of file to save to..." (I note it since it is not the normal Firefox save dialog title)

"Open in External Viewer" still works, but I wonder if there is any setting to return the default double click behaviour to this.
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