content lightning	jar:chrome/lightning.jar!/content/lightning/
locale  lightning en-US jar:chrome/en-US.jar!/locale/en-US/lightning/
overlay chrome://messenger/content/messenger.xul chrome://lightning/content/messenger-overlay-sidebar.xul
skin	lightning classic/1.0	jar:chrome/classic.jar!/skin/classic/lightning/
# shared pieces for chrome://calendar/
content calendar	jar:chrome/calendar.jar!/content/calendar/
locale  calendar  en-US jar:chrome/calendar-en-US.jar!/locale/en-US/calendar/
skin	calendar classic/1.0	jar:chrome/classic.jar!/skin/classic/calendar/