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How do I open all subsequent windows of firefox open in full screen without pressing the f11, only the first window opens in full screen

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Only the first firefox window opens in full screen, any subsequent windows I open are in normal size and I have to keep hitting the f11 key

Only the first firefox window opens in full screen, any subsequent windows I open are in normal size and I have to keep hitting the f11 key

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Take a look at this extension.
https://addons.mozilla.org/en-US/firefox/addon/r-kiosk/

Real Kiosk is a Firefox extension that defaults to full screen ...