I closed Firefox and tried to re-open it, but I keep getting a message that says "A copy of Firefox is already open. Only one copy of Firefox can be open at a time." Help!

My Mac laptop was working very slowly. I closed it but I can't re-open the version I had. I tried to move it to the trash and download a new version but, I keep getting the same message. How can I get rid of this copy and get back to work????

See:
* https://support.mozilla.com/kb/Firefox+is+already+running+but+is+not+responding

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http://support.apple.com/kb/ht1923
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Thanks for using the Apple Support Communities. Have a good one!
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I closed Firefox and tried to re-open it, but I keep getting a message that says "A copy of Firefox is already open. Only one copy of Firefox can be open at a time." Help!

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