Firefox Flatpak fonts workaround

Since switching to Debian stable, I’ve been using the Flatpak version of Firefox to use the latest version, which has a font rendering issue with some sites such as the web client for WhatsApp, some web mail clients, etc; showing pixelated fonts.

To fix it, edit ~/.var/app/org.mozilla.firefox/config/fontconfig/fonts.conf and paste the following:

<?xml version='1.0'?>
<!DOCTYPE fontconfig SYSTEM 'fonts.dtd'>
	<!-- Disable bitmap fonts. -->
				<patelt name="scalable">