/usr/share/perl5/Mojolicious/resources/public/mojo/prettify/run_prettify.js is in libmojolicious-perl 7.59+dfsg-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/perl5/Mojolicious/resources/public/mojo/prettify/../../../../../../javascript/prettify/run_prettify.js