How to remove the URL when printing a web page (Printing Orders)

Hi,
Does anyone know how to get rid of the URL at the top of the page when printing?

I have an invoice that's bring printed using the "Print-friendly page" page and at the top, it has the URL of the location....in my case my application is sitting on a different location and embedded in Joomla application so I really don't want the client seeing the URL on the top.

You can see the URL when you do a File ==> Print Preview in Firefox.
I do know that that you can change this from the Page Setup within the browser but looking for a solution that will not require the user to do anything.
Tx....