The Configure action for extensions wasn't working, raising an error in

the JS console about attempting to call undefined. The way list item

actions work, if there's a handler defined it will attempt to call it,

but otherwise it will just act as a link. The inclusion of the handler

name for configure inside the actionHandlers object meant it was

trying the former, but we never had defined the method it referenced.

Removing this entry makes it a link again.

Clicked "Configure" on an extension and saw it open the extension's

configuration UI.