Debugging
From Hackepedia
FreeBSD
I had a case where Mozilla Thunderbird would core on me as soon as I started it.
$ ktrace thunderbird
which created a file called "ktrace.out".
$ kdump -f ./ktrace.out
produced a lot of output, so much that I won't paste it here. These are the system calls that were made. You will most likely want to send that output to the appropriate helplist/bug report for that application.