Rated 3 out of 5 stars
Good (useful) extension. More visual feedback would make it really useful.
The problem for now is, one is not sure where the message will be moved after pressing "y". Suggestion for improvement:
Make it necessary to press "y" two times. After the first hit, show the location the message would be moved for 0.5-1 sec. If the user thinks the path is correct, he presses "y" again while the popup is displayed an then the message will be moved.