-content itsalltext chrome/content/
-locale itsalltext en-US chrome/locale/en-US/
+content itsalltext jar:chrome/content.jar!/content/
+locale itsalltext en-US jar:chrome/en-US.jar!/locale/en-US/
overlay chrome://browser/content/browser.xul chrome://itsalltext/content/itsalltext.xul