I want to use a program (Firefox) in full-screen mode on two screens for presenting. Like a "Kiosk".

When I press F11, Firefox goes to full screen, but only on one screen.

  • 2
    What OS are you on? Doesn't seem like a browser-question for me. – mreq May 8 '12 at 12:45

You need some solutions to make the OS recognizes the two (or more) screens as one like AMD's Eyefinity. Other alternatives being UltraView Desktop Manager and DisplayFusion

DisplayFusion has hotkey support for window movement, snapping to the sides of the monitors, maximization to span all monitors, and the ability to size windows to a percentage of the work area.

Make the Most of Your Multiple Monitors in Windows

You didn't specify the OS, but if it's Windows then this is possibly a duplicate of

For other OSes

You can also use autoit, autohotkey or any other available scripting language to resize the window to span across monitors

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