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display size on Mac PC

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bill268
bill268
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I have enjoyed Firefox for many years. The other day, it came up mobile device-size on my Mac PC screen. If I try "enter full screen" it now makes my second monitor go blank. Help.

I have enjoyed Firefox for many years. The other day, it came up mobile device-size on my Mac PC screen. If I try "enter full screen" it now makes my second monitor go blank. Help.