I get an error message that "a copy of Firefox is already open. Only one copy of Firefox can be open at a time"and I have no open copy.

I get an error message that "a copy of Firefox is already open. Only one copy of Firefox can be open at a time"and I have no open copy. How can I fix this problem? I like firefox because it runs many technical programs on the web that do not work with safari. I have FireFox installed on my PowerBook MacPro OS X 10.7.5 32.0.1 version. My activity monitor shows all activity of FireFox, so don't know not what he sees

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Tags: Firefox

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