Cannot open FF again without killing Firefox.exe

Not every time, but 9 x out of 10 if I close my entire Firefox browser (using the X or even File/Exit); the next time I try to open it, it says it's already running. I have to go into the Task Manager and End Task on firefox.exe
Sometimes I know this is already going to happen because I can't click on the Help button.

Hello.
These pages will probably help you:
http://support.mozilla.com/en-US/kb/Firefox+hangs
https://support.mozilla.com/en-US/kb/Firefox+is+already+running+but+is+not+responding
In any case, it's possible that you are having a problem with some Firefox add-on that is hindering your Firefox's normal behavior. Have you tried disabling all add-ons (just to check), to see if Firefox goes back to normal?
Whenever you have a problem with Firefox, whatever it is, you should make sure it's not caused by one (or more than one) of your installed add-ons, be it an extension, a theme or a plugin. To do that easily and cleanly, run Firefox in [http://support.mozilla.com/en-US/kb/Safe+Mode safe mode] (don't forget to select ''Disable all add-ons'' when you start safe mode). If the problem disappears, you know it's from an add-on. Disable them all in normal mode, and enable them one at a time until you find the source of the problem. See [http://support.mozilla.com/en-US/kb/Troubleshooting+extensions+and+themes this article] for information about troubleshooting extensions and themes and [https://support.mozilla.com/en-US/kb/Troubleshooting+plugins this one] for plugins.
If you need support for one of your add-ons, you'll have to contact its author.
If the problem is not disappears when all add-ons are disabled, please tell me, so we can work from there. Please have no fear of following my instructions to the line, as all can be easily undone.

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