Comment 2 for bug 1298539

Having discussed on IRC, I don't believe /etc/init/rc-sysinit.conf being delayed explains the symptoms described. User processes are started from a login session, which would be launched via lightdm; lightdm is 'start on runlevel and [...]', and the runlevel event is strictly later than the point at which we run the rcS scripts from rc-sysinit.conf.

If this were processes related to individual upstart jobs in /etc/init that might start before runlevel 2, then this could explain it; but given the problem described is with firefox being unconfined, that doesn't seem related to the delayed apparmor profile loading because firefox and lightdm are also delayed in that case.