Malicious Mozilla/Firefox/Thunderbird/Etc Extension

["Andrei Hanganu" <handrei () gmail com>]

I have recently started work on a xpcom component for Firefox,
astonished i was by the fact that in an XPI archive file one can
include binary libraries (dll/so files) that get auto loaded in
firefox via a precise function prototype. The problem is that the code
in that component is allowed to do anything the user that runs firefox
has credentials to do.
Wham i am curious is if there have ever been reported malicious
mozilla extensions, and if besides the signing of the addon is there
any other way to protect from such addons.

Andrei

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