Unable to kill the process of Firefox

Hello, I have worries mozilla v3, mozilla for some time to crash, with a report that appears (you want to send the information to mozilla) but after the crash mozilla is still displayed in the "process manager "and when I restart mozilla he said he is already under way, impossible to kill the mozilla, I tried to explore process and kill process, and every 2 can not kill the process, I am therefore have to restart the PC for Internet, someone would have a solution to avoid restarting ever? I am under Windows Vista.

Thanks in advance

I was also having the same problem running Vista Firefox hangs after 30 min,and then unable to kill Firefox process.

Hey uninstall your Current Firefox version and download the Latest version of Firefox. what error you get when you try to close Firefox ?

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what error you get when you try to close Firefox ?

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I get a message which says that " Firefox is already running, but is not responding. To open a new window , you must close the Existing Firefox process, or restart your system "

It's a Indications that your profile is locked to solve this check this link http://kb.mozillazine.org/Profile_in_use