'Fix' Firefox's "Firefox is already running but is not responding"

I have received this error way too many times. It seems that every time I close Firefox and choose to re-open I get this annoying notification.

Instead of rebooting, logging off, or entering into Task Manager to kill Firefox from running, I recommend downloading this file.

Simply download and run the file to close the unresponsive Firefox and open a new one.  

Note: Be sure to let this file run it's course before closing the black window that will appear after opening it.

This is what the downloaded batch file will do:

@echo off

REM taskkill will end firefox from running

taskkill /IM firefox.exe

taskkill /IM firefox.exe /f /t

echo.

REM all these pings below will allow a few seconds for Firefox to close

echo Trying to close Firefox...

ping -n 2 127.0.0.1>nul

echo wait one second

ping -n 2 127.0.0.1>nul

echo ...

ping -n 2 127.0.0.1>nul

echo ...

ping -n 2 127.0.0.1>nul

echo Trying once more...

ping -n 2 127.0.0.1>nul

taskkill /IM firefox.exe

taskkill /IM firefox.exe /f /t

echo ...

ping -n 2 127.0.0.1>nul

echo Trying to open Firefox...

ping -n 2 127.0.0.1>nul

REM Firefox will now attempt to re-open

start firefox.exe

You can even use this file as your default method of opening Firefox. Although you'll need to wait a few extra seconds for it to open, you can ensure it will always be closed before opening a new one, thus avoiding this error message completely.