Am 02.01.2016 um 22:52 schrieb Kyle Terrien:
It looks like that is only intended for release-status extensions. If I want to QA test a developer's beta build, this tells me that the developer would have to submit each build he wishes me to test to AMO. Why can't I just package the extension myself and load it? That is absurd. --Kyle Terrien
The official stance is that developers and testers should use the "Developer Version"[1] of Firefox. That release does not require extension signatures. [2] Jan Steffens (heftig) provides us with a compiled Arch Linux package in his repository. [3][4]
You can always provide or request an unofficial repository with binary packages of other firefox based projects.
1: https://www.mozilla.org/firefox/developer/ 2: https://wiki.mozilla.org/Add-ons/Extension_Signing 3: https://bbs.archlinux.org/viewtopic.php?id=117157 4: http://pkgbuild.com/~heftig/repo/ -- Andreas Bosch