I have installed
windows buttons extension from here and also have installed
global menu extension from here. Now after disabling them there is no menu-bar(i,e, file,edit, ...) and no title-bar(i,e, no minimize,maximize,close buttons and no title) when the window is maximized.
i have restarted my computer,press alt+f2 and write r no thing happen. then what to do to restore them ???