prerm is in icedove 1:52.9.1-1~deb9u1.
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 | #!/bin/sh
set -e
# Automatically added by dh_installdeb
dpkg-maintscript-helper rm_conffile /etc/icedove/pref/icedove.js 1:45.7.1-2\~ icedove -- "$@"
# End automatically added section
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