XF 1.5 Insert scripts into ALL pages running XenForo?

I have external fonts using Typekit, by Adobe which requires me to link the following code onto ALL pages that will be using the fonts.

<script src="https://use.typekit.net/XXXXXXXXX.js"></script>
<script>try{Typekit.load({ async: true });}catch(e){}</script>

How would i go about inserting that into the like core page files that run xenforo ?​
 
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