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Firefox is suddenly opening 2 windows on startup OS 13.5.1

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Since the arrival of Firefox, I have had it set to open automatically when my computer starts. Recently it has started opening in TWO windows on startup. If I remove Firefox from the 'open on startup' list, obviously it does not start at all. I cannot find any control to make it stop opening two windows. Is it a Mozilla problem, or an Apple problem?

Since the arrival of Firefox, I have had it set to open automatically when my computer starts. Recently it has started opening in TWO windows on startup. If I remove Firefox from the 'open on startup' list, obviously it does not start at all. I cannot find any control to make it stop opening two windows. Is it a Mozilla problem, or an Apple problem?

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Do both windows show the identical page (your home page), or do they show different pages, or does Firefox appear to be restoring an old session over and over?

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Both pages are identical (and slightly offset from each other).