From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; rv:1.7.3) Gecko/20040914
Description of problem:
It will close every time the transfer is sufficiently large,
but if I download something small and I have the
option telling it to close it won't close.
It's probably racy.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. See summary
Still broken a month later.
Still broken two months later.
Still broken, three and a half months later.
Closing bug, since it looks like it won't be fixed here.
I suppose I should file it at mozilla.org,
and it was a mistake to file here.
However, my experience with mozilla has been that bugs
don't ever get fixed.