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printer prints colors when set to B/W

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When printing directly from within Firefox, my printer Epson WF-7610 prints in color even if the setting is B/W. I am running Win11 on my PC and Firefox 111.0.1.64bit. When I download the pdf and i then print on the same printer from within adobe it prints B/W. I have seen other people have similar problems with other printers etc but I cannot find what is the fix. Can you help?

When printing directly from within Firefox, my printer Epson WF-7610 prints in color even if the setting is B/W. I am running Win11 on my PC and Firefox 111.0.1.64bit. When I download the pdf and i then print on the same printer from within adobe it prints B/W. I have seen other people have similar problems with other printers etc but I cannot find what is the fix. Can you help?

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Same problem. Dell MPF H825cdw

Print preview will show black and white when I select it, but the print actually comes out color.