close window button (x) unresponsive

I've set Zotero FF to open in Tab mode. The little 'x' closing button on the right side of the menu bar is unresponsive and shows now effect when Zotero's panel is in fullsecreen / tab mode. It's working perfectly fine and as expected as soon as I have the panel reduced to the bottom half of FF's window. While in practice it's easy to work around this by another click on the reduce button it doesn't conform to at least this user's tacit expectation that the x should close (or at least reduce) Zotero's panel also when the panel is in full view.

OSX 10.11.5 / FF 47.01 / Zotero FF
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