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Every time I try to start Firefox I get"A copy of FF is already open. Only one can be opened at a time" How o I get FF to work?

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I can't get Firefox to start up. I've downloaded a new copy several times and keep getting the error message, "A copy of Firefox is already open. Only one copy of Firefox can be open at a time". I do not have Firefox running anywhere.

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See "Firefox is already running but is not responding" error - How to fix, the image shown in that article is the Windows equivalent of the error message that you are receiving, but the information relates to the Mac.