Why won't Firefox close, even using Task Manager, unless I right click on the process and select 'end process' ?

Firefox works fine, but won't respond when I try to shut it down. Using Task Manager to 'End Task' doesn't work. In Task Manager I have to right click on firefox in the Processes menu and click 'End Task'. Apart from logging off/shutting down, this is the only method that works. Also refused to respond when I tried to reset and doesn't respond to commands to change profile settings.

SOLUTION (possible).
Hi all. I had this problem as well. I currently run FF26. A week or so ago, out of nowhere FF wouldn't exit - the window would close but firefox.exe process would keep running in the background using about 50% of CPU. Not sure if it's connected, but just prior to that I clicked on a link on Facebook that looked like spam website, nothing happened, site loaded (sort of, all I saw was a msg - Please Wait...) but nothing happened, I have Eset antivirus and it monitors network traffic and files for viruses, so maybe it prevented my PC getting infected...
So, I had this problem for a few days, was searching the net for solutions, but nothing seem to help. Then, just out of luck I did something that WORKED!
Here's what I did. I noticed that svchost.exe was using a lot of CPU alongside with FF. I ran ProcessExplorer to see what might be connected to this process, the list was long and I didn't have any idea where to start, so what I did was - Right click on svchost process, choose Debug and dismiss the warning. In a few seconds svchost process quit and after that FF started closing properly.
I had to re-enable all my plugins and themes I disabled prior, I also lost my history and preferences which I trashed in the process of searching for solution. But heck, it worked, hopefully for good. Now if someone could point out the real cause of this and fix it for everyone - that would be great. Cheers!

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