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Firefox 4.0b1 opening in 2 instances mac

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Whenever I open Firefox 4.0b1 on my Mac, 2 instances of it open. I can't tell which one exactly is the actual app, but one refuses to quit.

This happened

Every time Firefox opened

== I downloaded 4.0b1

All Replies (3)

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Now it's opening up in 3 instances!?

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exactly the same here.

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I confirm I have the same problem. It gets me confused when I use the dock or when switching apps.

This might come from the new plugin isolation system.