Empty customize toolbar button

First of all, Zotero is an awesome tool. I was just searching for a Scrapbook with sync option, andfinally came out with an Endnote substitution...

I noticed one minor cosmetic issue: After installing Zotero 2.0b7.6, in the 'Customize Toolbar' dialog of Firefox was a Zotero icon as expected, but also an 'empty' item beneath. This 'empty' item could be dragged to and removed from the main toolbar. In the toolbar, it could be clicked on, without function.

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