Developers and users are also concerned about add-ons being prevented from exploring radically new concepts which would require those "super powers" apparently taken away by the WebExtensions API.
I'd like to reassure them: Mozilla is investing a lot of resources to ensure that complex and innovative extensions can prosper also in the new Web-centric ecosystem. In fact, as mentioned by Bill McCloskey, at this moment I'm working within Mozilla's Electrolysis team and with other add-on authors, involved in the design of mechanisms and processes helping developers experiment in directions not supported yet by the "official" the WebExtensions API, which is going to be augmented and shaped around their needs and with their contributions.
https://hackademix.net/2015/08/22/webextensions-api-noscript...