For the record: this dialog only happens to me when using alternative window managers or xfce; metacity, when application doesn't responde to close request, offers to kill the it and does actually kill firefox "to death" - starting another instace directly after works.
For the record: this dialog only happens to me when using alternative window managers or xfce; metacity, when application doesn't responde to close request, offers to kill the it and does actually kill firefox "to death" - starting another instace directly after works.