Keep permissive addon model
It's what made firefox so popular in the first place!
Thanks for the feedback! Even with WebExtensions, Firefox will still have the most powerful add-ons model, and we’re eager to hear suggestions on what specific APIs we need to build and proposals on how to design them.
For one example proposal that aligns with a permissive ideology, see the native.js proposal from Giorgio Maone (the developer of NoScript and FlashGot): https://bugzilla.mozilla.org/show_bug.cgi?id=1199718
Mike Miller commented
Deprecating XUL (in combination with Australis) has been and will be the death knell of Firefox. So sad to see, and so avoidable.