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I close firefox and when I try to open it later, a pop-up says it is still running and I have to restart my pc?

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I close firefox and when I try to open it later, a pop-up says it is still running and I have to restart my pc? tried closing Firefox down but Task manager says it is NOT running even though the window that pops up says it is still running??

I close firefox and when I try to open it later, a pop-up says it is still running and I have to restart my pc? tried closing Firefox down but Task manager says it is NOT running even though the window that pops up says it is still running??

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When you go to task manager, go to the "processes" tab, right click on "firefox.exe," and select "end process tree." In the picture I've attached, I'm using windows 8, so the UI is a little different, but I hope it points you in the right direction.

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You really should figure out what is causing Firefox not to close cleanly.

https://support.mozilla.com/en-US/kb/Firefox%20hangs
See hang-at-exit