Well, I just updated Firefox on Ubuntu 14 to v43 doing
sudo apt-get update, and my old extensions stopped working as they are not signed. Mozilla has apparently stated that:
Installation of unsigned extensions will still be possible on Nightly and Developer Edition, as well as special, unbranded builds of Release and Beta that will be available mainly for developers testing their extensions.
The Nightly and Developer Editions of Firefox based on 42 and above will retain the preference to disable signing enforcement, allowing the development and/or use of unsigned add-ons in those versions. Unbranded versions of Firefox based on releases will also be made available for developers, and are expected to be in place for Firefox 42 for release (and potentially beta).
I don't want to install Nightly because I don't want to update every day; I don't want the developer version because it includes extra stuff I don't need. So, I wanted to try this "unbranded" Firefox build, which would apparently allow me to run unsigned extensions. But I'm looking everywhere for it, and I cannot find it. And Firefox 43 already landed, and (if I recall correctly), 43 > 42, so these "unbranded" builds should have already been available, no?
So, where can this unbranded Firefox be downloaded from? If it is not released yet, when will it be released?