Everything started happening: Windows 7 taskbar hidden Firefox down. Reappears if F11 key twice but then disappears again

Firefox is updated - 30.0, and I think that since the last update I can no longer see the taskbar. If I press F11 (fullscreen) twice he reappears, but then if I go to, say, a document word and return, he disappears again. Ditto if I click anywhere on the screen in firefox. Taskbar are locked and set to desktop wallpaper - they have always been.

It turns out that it was down to my having "slept" or put the laptop into "hibernation" several times without having close. After a shutdown and reboot, everything is ok again

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