Hi is the Custom Extension feature currently working? I have attempted to add my custom simple extension, plus the example extension with the manifest changed so the name is different, and in both cases the add extension dialog doesn't give an error, says the id is duplicated if I add it more than once, doesn't dismiss itself when there is no error, but the new extensions are never loaded and no other error is given.
I've tried both with Chrome and IE
Brand new interactions and interfaces. 
Easy to use and quick to get started. 
