offline.jar:
*   content/messenger-offline/msgOfflineOverlay.xul                (content/msgOfflineOverlay.xul)
*   content/messenger-offline/mail-offline.js                      (content/mail-offline.js)
*   content/messenger-offline/contents.rdf                         (content/contents.rdf)
*   content/messenger-offline/pref-offline.xul                     (content/pref-offline.xul)