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Cannot open in full screen

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Firefox was running in full screen. Without me doing anything it reduced it's size to about 1/4 screen. Everything I attempted to correct this has not worked . Any thoughts or suggestions on how to correct this is appreciated.

Firefox was running in full screen. Without me doing anything it reduced it's size to about 1/4 screen. Everything I attempted to correct this has not worked . Any thoughts or suggestions on how to correct this is appreciated.

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