Firefox will no longer work after uninstalling and reinstalling

I am running max osx 10.6.3 and when i closed firefox i couldnt reopen it unless i force quit the app or quit it completely before closing the browser so i uninstalled and then reinstalled but the problem persisted so I deleted the contents of the preference folder after installing then reinstalled but now everytime i try to open it it gives me an error saying "a copy of firefox is already open. only one cope of firefox can be open at a time". I restarted the computer several times but that didnt fix anything and i can no longer start firefox. I am assuming its because there is a file somewhere telling firefox that it is open but I can find it.
== This happened ==
Every time Firefox opened
== I reinstalled firefox ==
== User Agent ==
Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_3; en-us) AppleWebKit/531.22.7 (KHTML, like Gecko) Version/4.0.5 Safari/531.22.7

I cant really get into firefox to disable or uninstall them and while an extension may have been causing my original problem, it isnt anymore. Now its a problem with the firefox system files but I guess I may be wrong.

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Mozilla, like many other software companies, thoroughly test their software before releasing it to the public and I'm sure that no problem you are having is intentional.
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Firefox will no longer work after uninstalling and reinstalling

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