…is a mixed bag.

By printing “black” I mean printing using only black ink or toner, also known as grayscale. This works on Windows (10) but not macOS. Unsure about GNU/Linux OSes, but according to this page— [CUPS] In some printers, page is printed with colors even if “Black and white” mode is selected from print preview —it may not work there as well.

Also from that page is a hint to enable it. If you open about:config (from the location bar of Firefox) and search for “monochrome” you can find (or create if need be) a setting titled print.cups.monochrome.extra_settings and enter the appropriate variable and value for your printer. Which may require some sleuthing inside the PPD for your printer as not all companies use the same pair. In my case, printing to the parasite (an EFI/Fiery controller) on my Konica/Minolta “digital press” requires a value of EFColorMode:Grayscale in the above mentioned setting.