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How to force firefox open on main(First) or be selected monitor?

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I have 2 monitors. Sometime Firefox open on Second monitor.

How to force Firefox always open on main(First) or be selected monitor?

I have 2 monitors. Sometime Firefox open on Second monitor. How to force Firefox always open on main(First) or be selected monitor?

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If Firefox is maximized then make the window smaller and drag that window over to the correct monitor and close Firefox to save that setting.

After restarting you can maximize again.