Firefox won't start when double-clicked or when clicked on from the Start menu - but other programs say it IS running.

When I go to the START Menu to start up Firefox - *or* double-click the Firefox icon on the desktop - the program will *not* start. Yet if I try to do something that may interfere with Firefox, it says to close Firefox down because it's running.... which it isn't. Even going into the Task Manager through *control-alt-delete* shows plainly that Firefox is not running... I downloaded a game through Mediabox.com to watch a movie, that may have started the problem.

No - I get the message basically saying "Can't run program while Firefox is running. Please close down Firefox & try again".
I rebooted my computer and it all works now - but that's weird it was happening before. Kinda weirded out that it happened at all.
To avoid that happening again, I still wanna know what to do to avoid it or fix it for next time. Thanks

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