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Firefox will not open full screen

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Firefox will not maximize. I can mouse over it on the task bar and see it opened. But it will not display full screen or even part of the screen.

Firefox will not maximize. I can mouse over it on the task bar and see it opened. But it will not display full screen or even part of the screen.

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You use an out-of-date Firefox version. Update Firefox to 3.6.13. You'll have more details in Update Firefox to the latest release.