Try the following:
1. Press F11 to switch to the real Full screen
2. Press F11 again to switch to a normal maximized window
3. Switch from maximzed to normal Window 
You might get a window that is larger then your screen resolution:
4. Press ALT+SPACE, select Move and move the window so that you can reach the 
border
5. Resize the window so that it fits on your screen
6. Restart Firefox and hopefully everything works now

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The firefox window takes up all of the screen, impossible to reduce size and 
cannot access the close, reduce and clear screen options. The page also 
flickers when the mouse passes over certain areas of the screen. Firefox home 
page appears as a tiny page in the middle of the screen.
https://bugs.launchpad.net/bugs/276640
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