"a copy of firefox is already open." alert, however firefox is not open on my macbook. I have to take midterms, I need help with this ASAP!

I keep getting the "a copy of firefox is already open" alert and it's not opened. I have researched it and nothing is working. I have a macbook pro version 10.9

Try restarting the computer. If the problem continues, post back with more information about the specific error. Creating a screenshot of the error and posting it here using [[How do I create a screenshot of my problem?|these instructions]] might help (you could also use the Mac [http://en.wikipedia.org/wiki/Grab_%28software%29 Grab application] to create a screenshot in TIFF format, then resave it as a PNG to post here).
You could also look through this article:
[["Firefox is already running but is not responding" error message - How to fix it]]

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