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I have 2 tabs open, I close 1 and FF shuts down. Can anyone help?

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I will have 2 tabs open. Most often the one I leave open is Yahoo Mail. I close the other one and FF closes. FF is starting to do this more often.

I will have 2 tabs open. Most often the one I leave open is Yahoo Mail. I close the other one and FF closes. FF is starting to do this more often.

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We released Firefox 12 at last night, can you try to reproduct this crash and let us know?