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.
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