[dschep]

> allows you to install extensions on your own machine without seeking approval from Mozilla

Unless it changed quite recently, you can do this with normal Firefox builds too AFAIK

[gergles]

It changed, but not really that recently.

https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/Web...

Note specifically the step where the addon must be signed before it can be installed in this fashion. "Developer edition" does not require you have Mozilla's permission to install addons.