Firefox won't launch

I am having an issue with Firefox since I uploaded my firefox bookmarks from my old computer. Whenever I try to launch firefox, I get a message that says "A copy of Firefox is already open. Only one copy of Firefox can be open at a time." I cannot find any other open window for firefox or any duplicate applications that could be causing this. Any suggestions would be welcomed.

I haven't been able to get in to Mozilla support all day, but try googling "profile in use Mozilla." There's an article about this issue.
You can also post in the Firefox Support forum, no need to register. Make it clear this is a Mac. You should get help for this there.
http://forums.mozillazine.org/viewforum.php?f=38
And there's this thread about this issue to have a look at.
http://superuser.com/questions/8991/a-copy-of-firefox-is-already-open-only-one-c opy-of-firefox-can-be-open-at-a-tim
Message was edited by: WZZZ

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