This file is indexed.

postinst is in xul-ext-unity 3.0.0+14.04.20140416-0ubuntu1.

This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.

The actual contents of the file can be viewed below.

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#!/bin/sh

set -e

echo "Please restart all running instances of firefox, or you will experience problems."

if [ -d /var/run ] ; then
    touch /var/run/firefox-restart-required
fi