Cannot close firefox process, even after uninstalling and reinstalling firefox,and ending precess in task manager

Firefox will not open, says "already running". At task manager I cancelled process, and still no result. I then uninstalled all firefox files, and reinstalled. I still get same error message. I cannot open any firefox page. I have skype.
I followed troubleshooting info, an d still I cannot open firefox.
== This happened ==
Every time Firefox opened
== I restarted my computer

I removed the program and reinstalled by with no success, i get allways the same massage:
"Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system."
I don't know what to do can someone give directions
Thank you

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Cannot close firefox process, even after uninstalling and reinstalling firefox,and ending precess in task manager

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