I could be wrong but I think jolo did much of the leg work ensuring FP10.1 happened. He has left now, leaving romaxa as the main contact in the community. I doubt they'll pursue 11x, they decided to fall short of pursuing 11x as it was taking ages. Well, that was the main excuse they gave publicly... As for no FP11x being the reason I really don't know... There's no doubt some sites won't work, even when told Fennec's using FP11x.