There is a new gnome-shell build in Gnome3 Staging PPA (3.8.0.1).
This is built against libmoz-17.0-0 (and not libmoz185-1.0 anymore).
You need to upgrade packages gjs and libgjsc0 to versions 1.36.0+js17 at the same time.
The reason behind this is the new JavaScript engine Spider Monkey.