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Just got new imac, when I open firefox it says another copy is already open--not true as far as I can tell.

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Just bought new imac, system 10.6. downloaded firefox 4. when I try to open it, message comes up that another copy of firefox is already open, which is not the case as far as I can find out. What can I do?

Just bought new imac, system 10.6. downloaded firefox 4. when I try to open it, message comes up that another copy of firefox is already open, which is not the case as far as I can find out. What can I do?

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