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HOW CAN I PREVENT NEW FIREFOX WINDOW (2nd) FROM OPENING ?

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I prefer ONE window with many tabs because when a second window closes after the main firefox window all the tabs on the first window are lost.

Can I limit opening to one window only.

I prefer ONE window with many tabs because when a second window closes after the main firefox window all the tabs on the first window are lost. Can I limit opening to one window only.

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Set the value of the mentioned prefs like this: