and in fact this doesn't work. and it seems it doesn't even pass the proper values to [onMessage](https://github.com/mozilla/addon-sdk/pull/1454/files#diff-412ac2af37c7328b48a79cb30c95804dL383) above. does this not work, or is there a problem with our testing mockup `LoaderWithHookedConsole` class? did you test manually?