Songbird Global object creation property access

  1. Request the current artist, album and track title from the songbird object.
  2. Attempt to set the value of current artist, it should fail. Because the idl states that property as readonly the security check isn't even performed and a warning is generated, try/catch blocks won't catch the warning. If the property is not readonly but blocked by the security mixin then you will get an exception and can try/catch it.
  3. Get the current artist again to prove it hasn't been changed.