prerm is in firefox 52.0.2+build1-0ubuntu0.12.04.1.
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.
1 2 3 4 5 6 7 8 9 10 | #!/bin/sh
set -e
MOZ_APP_NAME=firefox
if [ "$1" = "remove" ] ; then
update-alternatives --remove gnome-www-browser /usr/bin/$MOZ_APP_NAME
update-alternatives --remove x-www-browser /usr/bin/$MOZ_APP_NAME
fi
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