content bitmask                    chrome/content/
skin    bitmask    classic/1.0     chrome/skin/
locale  bitmask    en-US           chrome/locale/en-US/
overlay chrome://messenger/content/messenger.xul chrome://bitmask/content/accountWizard/bitmaskMessengerOverlay.xul
overlay chrome://messenger/content/AccountManager.xul chrome://bitmask/content/accountWizard/bitmaskAccountManagerOverlay.xul
overlay chrome://messenger/content/am-offline.xul chrome://bitmask/content/preventCaching/bitmaskAmOfflineOverlay.xul
overlay chrome://messenger/content/messengercompose/messengercompose.xul chrome://bitmask/content/messengercompose.xul