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I need 2 screens of Mozilla on my Mac Air up and running at the same time. How?

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On my Mac Air, I have one screen running with Firefox. I want to get a second screen running also with Firefox. How do I do this?

On my Mac Air, I have one screen running with Firefox. I want to get a second screen running also with Firefox. How do I do this?

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I'm not quite sure what you are asking. Do you just want another window open? To do that Click on the File menu and select New Window (command+N).

You can even make each window full screen by clicking the full screen icon in the upper-right corner. It'll be like having two full screen Firefox apps.