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Apr 18, 2016 3:51 AM in response to Asrozasby John Lockwood,If you look in System Preferences -> Mission Control there is an option called 'Displays have separate Spaces'. If you have this enabled and put Safari in the 'Space' for Monitor1, and Firefox in the 'Space' for Monitor2 I believe this should do what you want.
You would first have both Safari and Firefox running and then launch Mission Control and then drag Safari and/or Firefox on to opposing Spaces. You can then switch between the spaces and make each full-screen.