A Copy of Firefox is already open. Only one copy of Firefox can be open at a time

I have shut down my mac for half a dozen times in response to the warning -- A Copy of Firefox is already open. Only one copy of Firefox can be open at a time -- that comes up each time I attempt to launch the browser. I have tried out the solutions suggested for previous users (on the Mozilla Forum) who were experiencing similar issues, but I can't even see Firefox on my Mac's Activity Monitor. What's going on?
I started experiencing this problem out of the blue on a networked computer two days ago (on Tuesday December 6). I have been using computers on this network for more than a year and it's only now that I have started experiencing this problem. Furthermore, I have been a Firefox user for more than four years and never encountered this issue. It's frustrating considering I have come to rely on Firefox as my browser of choice.
Other than this background I don't know what else to tell you by way of details.

Hi Swarnava,
Thanks for your prompt response. Intriguingly, when I logged on to my Mac (it's on a university network) this morning and launched Firefox it opened without a problem. If the issue resurfaces, I will try out the solutions you posted. Judging from the experiences of users who successfully trouble-shot their issues, apparently, Madakkadam's solution would be most helpful.
All the best.
Vukoni

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