Can't print to lexmark model X5470 printer. Get knocked off line when I try to print a document.

Anytime I try to print a document using Lexmark model X5470, i.e. boarding passes from Delta.com, or any other web site, I get knocked off line.
However; I can print the same items when on Internet Explorer, Safari, and Google Chrome with no problems.'''
I have an HP deskjet that works fine on Mozilla, but the Lexmark X5470 will not print from Firefox. It will; however, print a PDF document from Mozilla.

This may be a printer driver issue. I recommended first connect printer directly to computer and check for Software Updates, this will tell you if you have any printer updates.
If you are using a Mac computer follow troubleshooting steps in HT3500
(Basically, navigate to Print & Scan in System Preferences and right-click or control-click on printer from left and choose Reset Printing System, then re-add preferred printer.)
If you are using a Windows computer download and install Bonjour Print Services DL999

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