Can't print because I have no "print.print_printer" entry in my about:config list?

I haven't been able to print anything from Firefox for about a month now. My printer works just fine, as I can print from Internet Explorer and Iron browsers without issue. This ONLY happens when I'm using the Firefox browser. Please do not refer me to the article about printer issues - I have already exhausted everything on that list, without resolve.
I still sometimes use my older computer (same OS - Windows 7 Home Premium) and I checked the about:config list to see what it has that my current computer does not. I found MANY entries for my Canon MX340 computer! Why doesn't my current computer have ANY of these? The printer works perfectly fine with the older computer and Firefox, so I am completely at a loss here. Any suggestions?

Firefox 6.0 and later use '''print_printer''' for the last used printer.
In Firefox 5.0 and earlier versions '''''print.print_printer''''' was that preference name.
As explained here - https://support.mozilla.org/en-US/kb/fix-printing-problems-firefox#w_reset-firefox-printer-setting
My recommendation is to '''reset all Firefox printer settings''' as explained on that support page..

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