Firefox quit on my MAC, I uninstalled and now cannot install, keep getting error that it is open or file is missing. PLEASE HELP, have to use Firefox for work.

I have an iMAC w/OS 10.7.5. I was working in Firefox today and as I was entering letters it changed to unrecognizable characters so I had to exit the application. Firefox froze up and after trying to re-open it many times, I finally tried uninstalling and then re-installing. When trying to open a new download, I am given an error message saying that firefox is already open or that files are missing. I spent approx 2 hrs on the phone with Apple support and they were unable to locate problem and I am now turning to you for help. I need this fixed desperately and ASAP as the program that I use for work will only run on Firefox.

Remove all rules for Firefox from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox.
See [[Server not found]] and [[Firewalls]] and http://kb.mozillazine.org/Firewalls
See also http://kb.mozillazine.org/Error_loading_websites

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