Thanks for the hint.
Apparently, if "localhost" points to anything but 127.0.0.1, it will not affect 
most apps but it will affect Firefox.  I had the following in /etc/hosts:
^
127.0.0.1  somename  somename.someplace.dom
127.0.1.1  localhost
...

Changing cupsd.conf so

Listen localhost:631

reads

Listen *:631

solved the "403:forbidden" error on Konqueror accesses when accessing
http://127.0.0.1:631 -- but would not work when trying to access that
URL from Firefox.  Correcting /etc/hosts was what was needed.

I have no idea of how localhost became 127.0.1.1 on this machine -- but
the file was too clean for this to have been a manual edit. Cups logs
would indeed show accesses to 127.0.1.1 when any browser tries
http://localhost:631 before the correction to /etc/hosts.

To summarize: Configuration changes solved the problem entirely.
However, there are unexplained differences between the behavior of
Firefox and the behavior of Konqueror when accessing "localhost" and/or
127.0.0.1.

I do not believe I should keep this issue open :-( --- or should I say
:-)

-- 
Firefox print greyed out in Kubuntu 8.04
https://bugs.launchpad.net/bugs/311055
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