Installed fonts not detected on firefox 99 snap on Ubuntu 22.04

I am trying to use my installed fonts on the Firefox snap but I can't get it working. I'm trying to force a custom font on all pages using the Stylish.

Here's my script:

html > body {font-family: "SF Compact Display"}
html > body > code {font-family: "SF Mono"}

I have installed both the fonts above and this code is working on the all other browsers I have (including the deb version of firefox) but not on the Snap version of firefox. None of my system fonts can be used in web pages. I can't use the Firefox deb version because of Widevine crashes and other minor issues.

How do I get Firefox to detect the installed fonts?

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