This is an office that needs monochrome printing to suppress printing costs. Mozilla Mail prints coloured e-mail fine as monochrome (the printer has a counter for monochrome and colour prints), but Mozilla browser prints it as colour, despite selecting Grayscale in the Properties, and the printername.xp-ddx-identifier: XP-PCL-MONO in the printer file for all locales (C and en_US, the latter's printer file is a symlink to C's printer file).
Closing WONTFIX because nobody cares about Xprint. Reopen if you plan to address this bug.
Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.