What O/S version are you using? And did you install both Printers print drivers/software as well? I have a HP8400 and HP MD277DW both networked and drivers installed and have no issue which one to print to. Difference is in W10 it remember the last printer used and sets that unless you change it.

Windows 10 - drivers were installed - the printer that causes a problem is an older (much older) Zebra label printer.

epgriffin said

Windows 10 - drivers were installed - the printer that causes a problem is an older (much older) Zebra label printer.

If W10 can't find a printer generic driver for it then you fall into the category of Windows 10 stating that for older printers if there's no generic drivers found it will not work properly in Windows 10. This was something Microsoft talked about - not in length but did mention when migrating to Windows 10.

I know this is sacrilege on this site, but this all works fine with Chrome - the problem is I HATE CHROME & THE FILTH THAT PRODUCES IT. I need an option. It is difficult to always be resetting the print options in FF.  ??

Well since no one is there to see the problem then no one can verify what your saying here. The Browser doesn't install the printer that is the O/S that does that and the Browser uses the configure Printer setting for printing. What you need to do is backup any bookmarks and uninstall all FF and delete the Mozilla folder and then reinstall and run FF and import you bookmark back and see if that doesn't fix it.

epgriffin said

I know this is sacrilege on this site, but this all works fine with Chrome - the problem is I HATE CHROME & THE FILTH THAT PRODUCES IT. I need an option. It is difficult to always be resetting the print options in FF.  ??

Hi, if you did not like the response you got from westend can report to the right. Yes Firefox should be able to print to anything. Of course provided there is no corruption in any files. Win 10 holds all your printer options so that is something that you can check in System that they are what they should be. You can also search for Troubleshooter and run that and see if discovers any problems in WIn10.

Do go to the manufacturers website to see if there is any new drivers or firmware updates. The drivers that come in the box with a new printer or scanner or motherboard are out of date before you open it.

I would think that you would have to designate each time you print which printer you are going to use in the print dialog popup window if that is turned on. As one comes up for me where I choose which printer, ex : my HP or print to pdf or use MS printer stuff. You may need to figure that out as it is a confirmation box is to are you sure and which printer.

Can read these please as these usually cure the issue.:

• https://support.mozilla.org/en-US/kb/fix-printing-problems-firefox
• http://kb.mozillazine.org/Problems_printing_web_pages

Please let us know if this solved your issue or if need further assistance.