I get the following message Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system. but can't close the program without rebooting
Can't close Firefox in windows 7 without rebooting
This happened
Not sure how often
== After upgrading to 3.6.3
Can't close Firefox in windows 7 without rebooting
== This happened ==
Not sure how often
== After upgrading to 3.6.3
Wšykne wótegrona (1)
See http://kb.mozillazine.org/Firefox_hangs and Firefox hangs or is not responding - How to fix (Hang at exit)