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I cannot exit fullscreen in thunderbird 35.5.1 for linux

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The minimize, maximize and exit buttons in the top right corner have disappeared. I am using Linux Mint 17.

The minimize, maximize and exit buttons in the top right corner have disappeared. I am using Linux Mint 17.

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In the XFCE desktop that I use the key combination is alt + space: this brings up a menu to restore the normal maximised window with the buttons visible. I don't know what the key combo is for Cinnamon, I guess it's in the user guide somewhere?

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The Mint 17 I am using is the Qiana version with KDE not Cinnamon........

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