Interesting tidbit
"I'm fed up as an add-on developer, I'm fed up as a mozilla advocate, I'm fed up as somebody who used to help the other add-on devs, I'm fed up as somebody who contributed an enormous amount of volunteer time directly in many different ways, I'm fed up as a Firefox user."
From the developer of the downthemall addon with 1.2 million users. Here
http://www.downthemall.net/re-downthemall-and-webextensions-or-why-why-i-am-done-with-mozilla/