I can't get firefox to open, i just get a message

Each time i open it this message pops up. "a copy of Firefox is already open. Only one copy of Firefox can be open at a time." but i dont have a copy open, i actually removed the program and re-downloaded it after it started happening and yet it still happens

Try to delete the mimeTypes.rdf file in the Firefox Profile Folder.
* http://kb.mozillazine.org/mimeTypes.rdf
* http://kb.mozillazine.org/File_types_and_download_actions#Resetting_download_actions
You can use this button to go to the Firefox profile folder:
*Help > Troubleshooting Information > Profile Directory: Open Containing Folder

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