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