Bug 826146 - Add a pref-controlled install confirmation override for automation. r=sicking, a=sicking
Bug 786631 - Get processes with non-default permissions on the prelaunch fast path. r=dhylands, r=jlebar, a=tef+

Contains these patches

Bug 786631, part 1: Refactor privilege adjustment. r=dhylands
Bug 786631, part 2: Make the prelaunch process totipotent and specialize when it's taken. r=jlebar
Bug 831438 - Add pref for forcing 16bit on B2G. r=cjones, a=tef+

B2G currently tries to detect the depth of the screen and uses
that as the offscreen format. This lets us override that
for testing the 16bit path on 24bit devices.
Bug 831617 - Killed process when change settings. r=sicking, a=tef+