Firefox won't start. The program is running in the task manager processes, but the application won't open. I have restarted the computer, uninstalled and reinstalled, now I am lost!!!

I have a Dell Inspiron 530 desktop running Windows Vista Home edition. Firefox was working properly just as it has for years. All of a sudden when you click on the icon, nothing appears. I open task manager, no applications show. I go to processes, there is firefox32. I kill the process and start over...endless loop. I shut the computer down and restarted. Same issue. I uninstalled firefox and reinstalled, same issue. I idon't know what else to try.

If it does work in Safe-mode then disable all extensions and then try to find which is causing it by enabling one at a time until the problem reappears.
* Use "Disable all add-ons" on the [[Safe mode]] start window to disable all extensions.
* Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")
* https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

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