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Re:Firebug lives on in Firefox DevTools by nachtigall on Wednesday December 21, 2016 @06:45AM (#13228397)
Don't think you're right. You can use FDE for add-ons development, just like parent said.

See your sibling below: > Unsigned addons cannot be enabled on beta or release. That was only available for a limited time. Now they can only be enabled on alpha (aka developer), nightly, or special unbranded builds.

Re:Firebug lives on in Firefox DevTools by carussell on Wednesday December 21, 2016 @11:48AM (#13230542)
Please read and understand the entire comment chain you're replying to. I'm well aware that you can use Firefox Developer Edition to develop add-ons. (I'm the one who first mentioned it!)