I updated to firefox 18.0 and suddenly all of my bookmarks and explorer bar windows are messed up. how do i fix this?

basically any time I open up one of the windows at the top of my firefox, such as "bookmarks", the real firefox window where my browsing is is duplicated into my bookmarks menu. This only started happening immediately after installing version 18.0. I tried updating my graphics plug-ins, as well as un-installing all previous firefox versions, including the current one, and re-istalled. None f this fixed the problem. I've included an image of this happening on my browser

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