How do I reset Firefox if I am not able to open the application after ending it on the task manager?

We changed the privacy options on firefox, closed the program, and now we are not able to open it. We have ended the process on the task manager, but it still will not open. We tried to uninstall it but it won't even let us do that. I've read lots of articles on how to reset firefox, but it isn't helpful when i can't get into firefox to try it.

See:
*http://kb.mozillazine.org/Browser_will_not_start_up
You can use one of these to start Firefox in <u>Safe mode</u>:
*On Windows, hold down the Shift key while starting Firefox with a double-click on the Firefox desktop shortcut
*On Mac, hold down the Options key while starting Firefox
*Help > Restart with Add-ons Disabled
*https://support.mozilla.org/kb/Safe+Mode
Can you bring up the Profile Manager to create a new profile?
*http://kb.mozillazine.org/Profile_Manager
*https://support.mozilla.org/kb/Managing+profiles

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