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I am running lion 10.7 i keep getting this message when I try to open firefox after downloading,A copy of Firefox is already open. "Only one copy of Firefox can be open at a time"

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I tried to delete my old version of firefox because it wouldn't open certain websites that safari would, when I download new firefox I keep getting this message when I try to open

I tried to delete my old version of firefox because it wouldn't open certain websites that safari would, when I download new firefox I keep getting this message when I try to open

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Create a new profile as a test to check if your current profile is causing the problems.

See Basic Troubleshooting: Make a new profile:

If that new profile works then you can transfer some files from the old profile to that new profile (be careful not to copy corrupted files)

See: