No navigation icons in Firefox using Material Design 3

My navigation bar looks like this innFirefox:
Web-nok

Whereas in Chrome it looks normal:
Web-ok

The site link:
https://betere-it.nl/

The ‘old’ Material Design renders the icons fine. Is this because another icon lib is used? They start with fa: in the Anvil IDE wheres the M3 starts with mi:

Anyone any idea how to fix this?

It looks fine on Firefox mobile (iOS). Perhaps try clearing browser cache and/or open up a incognito tab?

My Firefox mobile Android looks fine as well. Problem remains with incogniti tab on PC.

I use Privacy Badger. If I disable this on the mentioned site the icons a rendered normally. Apparantly Privacy Badger blocks these fonts that are downloaded from internet.

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