barley.xpi broken

[Ben Bucksch]

<http://www.mozilla.org/docs/xul/xulnotes/xulnote_packages.html>

The barley.xpi example package does not work - I can install it, but 
loading it via entering <chrome://barley/content> in the urlbar brings 
up an empty directory viewer with the throbber spinning practically 
infinitly. Similarly, starting Mozilla as suggested (via |mozilla 
-chrome chrome://barley/content|) prevents Mozilla from starting up.

What's wrong / what changed?