Hello, I am using Firefox 35.0.1 and just today something strange has started to happen. In my task bar when I open Firefox as I am sure you know, an icon appears in the lower left. As you also probably know when you open more than one window you can see a window behind the first icon indicating another window is open. Each time I open Firefox, an extra window opens that I did not open so if I opened 2 windows the icon in the task bar has 2 pages behind it, if I open one window, there is a page behind the icon. When I mouse-over that extra icon in the task bar the thumbnail image that shows is of the upper left hand corner of a browser window but you only see 250 pixels to the right and maybe 200 pixels down, so you see File Edit View History Bookmarks Tools Help and a bit of grey and down you see the url window and a small part of my homepage which is google. Well actually what you see is just white and I assume it is that part of a google homepage but who knows...Anyway, if I move my mouse over that thumbnail image what appears on the screen is an 800 by 600 transparent box... Also, if you click on the thumbnail to call this window to open, the shadow box goes away and there is no window anywhere to be found. And, the window will not go away unless I close all Mozilla windows, I cannot close this window if I click the red 'X' in the thumbnail. I have tried to take a screen shot to show you and something even stranger occurs...When I take a screen shot there is no shadow but an image of the other browser window that I did open, so whatever page I am on in the other window appears in the transparent box. Sometimes you see the whole window but sometimes the picture catches a browser window in the process of opening to full size, please see pictures one and two. Explaining this has been difficult, I wish the screenshots actually showed you what i see, I hope I have not driven you crazy with all the details..I have tried to upload my pics which are gif images that are 87k and 38k but the upload doesn't work, the little circle just keeps going around and around and around so I can't get the darn images up here...Very frustrating. If anyone out there can assist I would appreciate it. Should I remove Mozilla from my machine and reinstall? If so, is there some special uninstall steps I should do to make sure I get all files? Any suggestions are appreciated. Thanks Jen