prerm is in firefox-esr 52.8.1esr-1~deb8u1.
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 -e
if [ "$1" = "remove" ] || [ "$1" = "deconfigure" ] ; then
update-alternatives --remove x-www-browser /usr/bin/firefox-esr
update-alternatives --remove gnome-www-browser /usr/bin/firefox-esr
fi
if [ "$1" = "remove" ]; then
rm -rf /usr/lib/firefox-esr/updates
fi
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