Firefox says I am already running Firefox,and I have to close the first one first.Only it's not running and I have to re-boot my computer in order to access Firefox.

I have been using other browsers because of this annoying problem,and don't want to because FF is my favorite.
Also,in addition to the problem above:When I launch FF to get to my home page,two FF's open.I have to tick one to get back to just one.This happens every time.
Also:No matter when I launch FF and attempt to start surfing,I always get the message that FF cannot find whatever webpage I am looking for,including my home page.
FF was running beautifully,as always,until this started a month ago.I attempted to uninstall FF so I could start over,but it doesn't appear in my "uninstall" folder in my control panel.
I purchased a registry cleaner program a few days ago,hoping somehow it might help,but it has not.
Thank you

See "Hang at exit":
*http://kb.mozillazine.org/Firefox_hangs
*https://support.mozilla.com/kb/Firefox+hangs

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