Maybe check your printer software for configuration.

Hi Andrew, Firefox typically sticks with the last printer you used, so if you find that you need to keep changing this, perhaps it's a setting. To check on that: (1) In a new tab, type or paste '''about:config''' in the address bar and press Enter/Return. Click the button accepting the risk. ''More info on about:config:'' [[Configuration Editor for Firefox]]. ''The moderators would like us to remind you that changes made through this back door aren't fully supported and aren't guaranteed to continue working in the future.'' (2) In the search box in the page, type or paste '''print_printer''' and pause while the list is filtered -- this preference should list the name of the last-used printer. Is it stuck on the nonexistent printer? Does it show a "lock" icon? ''Assuming that preference is not locked:'' (3) In the search box in the page, type or paste '''print.save_print_settings''' and pause while the list is filtered. If the preference is bolded and has a value of false, double-click it (or click the Toggle button or Reset button at the right end of the row) to restore the default value of true Anything unusual there?