I couldn't update Firefox so I attempted to do an uninstall and reinstall Firefox 12.0 on Mac OS X 10.7.4 keep getting message A copy is already open.

I attempted to uninstall and reinstall Firefox get message Firefox already open

I could not open Firefox 13.0.1 when I updated to Mac OS X 10.7.4
I receive the following prompt:
'''A copy of Firefox is already open. Only one copy of Firefox can be open at this time.'''
I created a new OS user:
System Preferences> Users & Groups> click on the "+" symbol, bottom left to create new user & save profile.
Log out of current profile and log in to new OS user profile.
Open Firefox in new user to see if the application opens.
In my case the application opened. I then logged out of the new user profile and logged back into my old profile & followed the directions in the following weblink:
The following link resolved the issue:
'''http://kb.mozillazine.org/Profile_Manager#Accessing_the_Profile_Manager'''
Scroll down to: Accessing the Profile Manager > Mac OS X
Close the application completely and make sure that it is not running in the background. Assuming the program is installed in the "Applications" folder, launch Terminal ("Applications -> Utilities -> Terminal") and enter the command starting with / after the prompt in Terminal:
(Firefox) '''/Applications/Firefox.app/Contents/MacOS/firefox-bin -profilemanager'''
I then deleted the old profile and created a new profile.
I was then able to open Firefox.

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