Have you messed about in Firefox's font settings?
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Does it happen with a fresh Firefox profile too? Run firefox --ProfileManager
to open the GUI, click Create Profile and then Start Firefox with it. After checking if you still have the issue, go back to this menu and select your previous original Profile to restore it.
did you block loading fonts in an addon, like ublock?
No and that has nothing to do with it. My local font should not produce this icon.
In fact, when I paste the emoji into UI elements in Firefox, it's the correct one.