Not sure if I like calling something a bug, when really the bug probably stems from FireFox. When you manage outbound routes and you want to change the order of the routes you are using Ajax to allow you to move the sequence/priority.
Apparently in FireFox 10.0.2 that doesn't work. I was able to change it in Chrome.
I don't know if there should be extra hooks in there to discern between browsers to work around these types of issues which shouldn't exist.