Hmm. Well Kihon, I really dont know what to say lol. If you're running vb 3.5.4 and you're logged in as a user who has uploaded a custom avatar, and you are still seeing an X or nothing in firefox, then something is setup incorrectly on your server or your vbulletin forum.
If you'd like i'll PM you the URL to a test board I have running the plugin with nothing else installed and it works just fine.
Have you tried taking off the 'default avatar' hack you had installed?
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