I think maybe a general add-on for development (much like Firefox OS Simulator) is a good idea. There are many features that Chrome addon's and r2d2b2g have similar (load a directory, reload addon/app) that I think are minimum requirements, but can go beyond that like the FFOS Sim having a hook into the console (which we can do with Mike's debugging work, which would be insanely awesome. Click a button and get the debugging info for the selected add-on.

@canuckistani you're saying this should be a specific add-on first, rather than built into FF? I like the separation and independence of that, but wonder how we can get adoption switching to that, while deprecating CFX