Thanks for all the replies above. One of you pointed out a print icon on
the page and that works.
I tried printing the page with the same printer using IE 11 and that
works. Given that information the usual conclusion is 1) the page is
using some obscure out-of-spec feature that IE supports or (non
exclusive) 2) FF has a bug.
I tried the PS interface to the HP4300ND, i.e. a different personality
of the same printer and that did not work in FF; neither did the Cute
PDF pseudo printer. So I'm pretty sure the error occurs before
printer-specific software is reached.
For the record: Win 7 Pro 64bit SP1.
--
Jeff Barnett