After closing, Firefox still remains in task manager's processes and could not open again!

I'm using Windows 7 Professional. I installed FireFox version 6.0.2 few days ago. Now I have problem with this. When I close the browser, it was normal .But when I open it again, nothing happens! I open Task Manger of windows, move to processes tab and I see some processes name firefox.exe. After I close all those processes completely, I can open it up. I don't know what exactly the problem is but it makes me feel upset. Please give me more info and the way to solve this. Thanks you so much.

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

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