If you are using Mozilla FireFox you may notice that when you print out an invoice for example, that you get a URL on the top of the page, also a time stamp and date at the bottom of the page.  This is a setting configured in FireFox.

Disabling

To turn this off you will need to open FireFox, then go to File > Page Setup > Margins & Header/Footer.  Here you will need to set all fields to ‘Blank’.  The documents should now print without the unwanted URL or timestamp.