Can you please do a couple of things.
1. give the output of apt-cache policy firefox
2. give us a screenshot of print preview
3. attach a picture of the page after you print it
4. check the amount of black ink you have left.
5. check your printer settings
** Changed in: firefox (Ubuntu)
Status: Unconfirmed => Needs Info
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Printing with firefox does not work
https://launchpad.net/bugs/77786
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