Can't print from Firefox - "Printer Error- An unknown error occured while printing"

I am unable to print anything from Firefox! I am using Firefox 19.0.2.
I performed a "Reset To Default State" for Firefox yesterday to fix some performance issues. Those issues are resolved, but now I can't print!
I am able to print to 'Microsoft XPS Document Writer' and save as an .xps file. But I am unable to actually print to my HP LaserJet printer.
Here are the steps I have taken trying to resolve the printing issue-
I opened the prefs.js file in WordPad and removed all entries beginning with 'print'.
(When it did not resolve the issue, I restored the prefs.js file with a backup)
I downloaded and installed the latest driver for my printer from HP.
Still unable to print from Firefox after taking those steps. Note that I am able to print from any program other than Firefox.
What steps can I take to fix this issue?

@sklein65
I thank you for your reply. My problem occurred when trying to print to the XPS printer, I found, that, if I disabled the UAC, the problem went away. You may want to give this a try. You can access you UAC by entering 'UAC' in the Window's Search Box. I had an additional problem with my 'Pinned' websites becoming unusable, I traced this down to Firefox version 24 (beta channel). I reverted back to v23.0 and I never had the problem, again. Note, that, all versions of v23.0 worked, the problem occurred when v24 was installed. I disabled all auto updating in Firefox.

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HI sjane39,
Here is a support page for troubleshooting printing from Firefox. It appears as though if you can print from IE that your print drivers are installed and working properly. It sounds like a setting in Firefox.
Let us know if this helps.
For your fax issue you can run the Fax Diagnostics Test. It will help diagnose and resolve common fax issues.
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Can't print from Firefox - "Printer Error- An unknown error occured while printing"

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