Order Printer: import Font-face from external link (not Google) by cnotv

Hello there!
I'm editing a template for a shop and I need to customize the fonts with one provided by the studio which I'm working for.

I've inserted the font-face from "hello.myfonts.net" and applied to the class of my table.
It works on Chrome, but unfortunately not on Firefox.
The printing is also fine.

Any suggestions?

I used the standard way to manage it:

 

<style type="text/css">
@import url("//hello.myfonts.net/myfonturl");
@font-face {font-family: standard stuff;}  </style>

Should I encode it in base64 or use the direct link from the file in the Template/Assets?

Thanks in advance and also thanks for the App.