Bug 899939 - Fix some tests that still use prefBranch instead of SpecialPowers.pushPrefEnv. r=jmaher
Bug 852250 - When restarting recompute the process startup timestamp instead of using the timestamp stored it in MOZ_APP_RESTART during the shutdown procedure. r=nfroyd
Bug 889182 - mozapps/extensions xpcshell tests cannot be run concurrently. r=Unfocused