zotero will not shrink down

Hi. I'm using Zotero 1.0.9 on Firefox 3.0.5.
My Zotero took up the whole browser window without using the full-screen view option. The top of the Zotero window got stuck with the top of the browser window. I place my pointer at the bar and the vertical double-headed arrow mark appears, but I cannot drag it down.
Zotero still functions, although it's extra trouble closing it every time I browse websites, and reopening it to create or edit items.
Any suggestions how I might shrink Zotero back down?
Thanks!

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