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This extension works fine. But it hides icons for S/MIME reporting about the e-mail (signed, encrypted) even it does not hide ENIGMAIL/PGP information (signed, encrypted). This is not possible to file bug report (the Bugzilla says I'm not approved to file bug against this component).

这个评论是针对附加组件的一个早期版本的(2.0.8)。 

Sorry but I cannot confirm this (with Thunderbird 33.0 beta and CompactHeader 2.0.9beta2)
Could you please post a bug report with additional information (Thunderbird/CompactHeader versions, screenshots?) to the support forum:
http://forums.mozillazine.org/viewtopic.php?f=29&t=1405155&p=7170965