metrics.jar:
% content metrics %content/ xpcnativewrappers=no
% skin    metrics classic/1.0 %skin/
% locale  metrics en-US %locale/en-US/
  content/prefs.xul               (content/prefs.xul)
  skin/prefs.css                  (skin/prefs.css)
  locale/en-US/prefs.dtd          (locale/en-US/prefs.dtd)