Mozilla allegedly stands for a bunch of stuff that is be definition incompatible with hosting code on GitHub as it is.

Your statement is fundamentally wrong on many levels, including the fact that it goes against the fundamental premise of FLOSS which is that “the users have the freedom to run, copy, distribute, study, change and improve the software.”

I bet a lot of people were expecting a lot more from them (…)

You only speak for yourself. You do not have a mandate to speak on behalf of anyone, including Firefox users such as myself. Keep your personal opinions as personal. You have the right to have a personal opinion, but you do not have the right to pass them off as anyone else’s.