The close button there is for closing the Window not Firefox. To close Firefox use File > Exit, or "Firefox" button > Exit. You might see if you can do the equivalent with "Alt+Spacebar" (a Windows shortcut) which can also be used if you can't grab the title bar to move a window, allows you to move with the 4 arrow keys. I would close Firefox by terminating it through the Windows Task manager if nothing else works. Windows 7 use "Ctrl+Shift+Esc" then process tab , select firefox.exe and use "Del" key or right-click and close tree. Bring up Firefox again, if the problem persists that toolbar buttons do not work then use steps in http://kb.mozillazine.org/Corrupt_localstore.rdf <br><small>Please mark "Solved" one answer that will best help others with a similar problem -- hope this was it.</small>