After closing out, FF will not restart, says it is already running forcing me to reboot. I have removed and re-installed FF and still get the same message when trying to open the internet using FF. How can this be fixed?

Question

When I close out Firefox, and return later to use the internet, I click on Firefox and it gives me a message stating that Firefox is already running and needs to be closed before restarting or reboot my system. This occurs every time Firefox is closed and attempt to re-start it,,, not only at times,,,, EVERY time.
I have tried removing Firefox from my system and re-installing to fix this issue however,,, this did not work. After re-installing, I still get the same message when attempting to restart Firefox.
I have also tried Ctrl, Alt, delete to open the task manager and find there is no task to close.
I do not have any problems when using IE, I prefer to use Firefox as it is faster and crashes less than IE.
I am very frustrated at having to reboot my system each time I want to use the internet.
How can this problem be repaired?

Answer 1

There are various causes for this error, see [[Firefox is already running but is not responding]] for details.