/usr/share/doc/groff-base/html/mom/ is in groff 1.22.3-9.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/groff-base/html/mom/appendices.html
/usr/share/doc/groff-base/html/mom/color.html
/usr/share/doc/groff-base/html/mom/cover.html
/usr/share/doc/groff-base/html/mom/definitions.html
/usr/share/doc/groff-base/html/mom/docelement.html
/usr/share/doc/groff-base/html/mom/docprocessing.html
/usr/share/doc/groff-base/html/mom/goodies.html
/usr/share/doc/groff-base/html/mom/graphical.html
/usr/share/doc/groff-base/html/mom/headfootpage.html
/usr/share/doc/groff-base/html/mom/images.html
/usr/share/doc/groff-base/html/mom/inlines.html
/usr/share/doc/groff-base/html/mom/intro.html
/usr/share/doc/groff-base/html/mom/letters.html
/usr/share/doc/groff-base/html/mom/macrolist.html
/usr/share/doc/groff-base/html/mom/rectoverso.html
/usr/share/doc/groff-base/html/mom/refer.html
/usr/share/doc/groff-base/html/mom/reserved.html
/usr/share/doc/groff-base/html/mom/stylesheet.css
/usr/share/doc/groff-base/html/mom/tables-of-contents.html
/usr/share/doc/groff-base/html/mom/toc.html
/usr/share/doc/groff-base/html/mom/typesetting.html
/usr/share/doc/groff-base/html/mom/using.html
/usr/share/doc/groff-base/html/mom/version-2.html