I think something that would be useful as a dev tool in FF, which only chrome right now has a decent tool for is restful url testing, similar in part to https://chrome.google.com/webstore/detail/advanced-rest-clie... I haven't seen anything even remotely similar for FF, maybe a optional plugin for this kind of tool, it would make my development process much quicker for the client-side code which is being used for restful interfaces. especially if we can maintain our session when submitting information.