Hi Terry, I am sorry to hear your printers are not displaying. Are you missing wireless printers and do they all display on other browsers? ( Chrome / Edge ) If you can, check if you are current or need to update printer software by visiting their websites. Related thread for wireless Canon printer : [https://support.mozilla.org/bm/questions/990916 Firefox no longer recognizes wireless printer! HELP!] {link} Fixing Printing Problems in Firefox : [https://support.mozilla.org/en-US/kb/fix-printing-problems-firefox#w_reset-all-firefox-printer-settings Fix printing problems in Firefox] {link}