This file is indexed.

preinst is in firefox-locale-br 45.0.2+build1-0ubuntu1.

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

MOZ_APP_NAME=firefox
MOZ_LIBDIR=/usr/lib/firefox
MOZ_ADDONDIR=/usr/lib/firefox-addons

if [ "$1" = "install" ] || [ "$1" = "upgrade" ] ; then
# Keep until 12.04 is EOL
# ${LIBDIR}/distribution was a symlink in 11.10
    if [ -h ${MOZ_LIBDIR}/distribution ] ; then
        rm -f ${MOZ_LIBDIR}/distribution
    fi

# Keep until 12.04 is EOL
# This used to be a symlink
    if [ -h ${MOZ_LIBDIR}/distribution/searchplugins ]; then
        rm -f ${MOZ_LIBDIR}/distribution/searchplugins
    fi
fi