I think I'm missing a plugin...
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For me, it's a bit of a classic WTF (I've took this image about 10-ish years ago), but found it when rummaging through some folders on my HD - It comes from a Mozilla 0.x release, long time before it became the beast that is Firefox...
(http://img188.imageshack.us/img188/2821/mozillaplugin.png)
Can you say "Recursive"?
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They actually still have that plugin in Firefox, but they renamed it the "Mozilla Default Plugin" now. Still, it doesn't pop up like that in FX3.
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The best bit is that you can actually disable the Mozilla Default Plugin. Not willing to try it right now though....!