The mozilla-xprint behavior is mostly controlled by the settings in
/etc/Xprint/C/print/Xprinters.
On my machine the above named file exists and contains the lines referred to
below. But it also contains the following comments:
<quote>
# X*printers sample configuration file
#
#
# This file belongs in /usr/lib/X11/X*printers, where the "*" is the
# display number of the server. For example, if the server is
# invoked using the command X :0, then the X0printers file is used.
########################################################################
</quote>
When I make changes to this file and restart my X system, I see no change
in behavior. Perhaps I need to make a copy per this comment. But this
seems to me to violate Debian policy, so I wonder if there is not something
else that should be done instead.