Using nsISimpleEnumerator
or(enum, interface) { while (enum.hasmoreelements()) { yield enum.getnext().queryinterface(interface); } } var b = document.getelementbyid("stringbundleset").firstchild var props = generatorfromenumerator(b.strings, components.interfaces.nsipropertyelement); var s = ""; for (let property in props) { s += property.key + ' = ' + property.value + ';\n'; } alert(s); links code based on using_nsipasswordmanager nsisimpleenumerator xul:property:strings ...