Firefox wont open, because of multiple copies? !

I uninstalled and reinstalled Firefox. Now when i open the new firefox i get an error message:
"Close Firefox.
A copy of firefox is already open. Only one copy of Firefox can be open at a time."
Ive uninstalled again, empied the trash, searched the computer for traces (at least thats what i think i did) and nothing works help!

Its not on there. at least not in a form that i would recognize, theres lots of stuff on there that doesnt look familiar maybe its one of those

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