Brother HL-2270DW printer problem
After "refreshing" my Mozilla Firefox v.71 (63 bit) on a Dell Windows 10 PC, whenever I print, the printer displays an error light and when I press the green "Go" button on the printer, it no longer prints duplex on my Brother HL-2270DW printer. In addition to printing only single-sided, it also prints an extra blank page. The printer works fine (i.e. duplex without extra blank page) with all other applications (e.g. MS Internet Explorer, MS Word, Adobe Acrobat, etc.).
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Have you tried resetting your printer settings in Firefox?
https://support.mozilla.org/en-US/kb/fix-printing-problems-firefox
Let me know.
Yes, but without success. When I tried to reset just the Brother HL-2270DW printer, I right clicked on the print.printer setting but "Reset" did not appear. Moreover, when I tried to reset all Firefox printers, I did not have a "prefs.js" file in my Profile folder.
CORRECTION: ...I right clicked on print_printer...
They changed the reset in this instance to delete, since they changed about:config to a webpage. Try trashing it by clicking the delete button next to print_printer and resetting it back up and see if that resolves the issue.