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 http://tinypic.com/r/28p2l2/6