/usr/ is in browser-plugin-libreoffice 1:4.2.3~rc3-0ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/libreoffice/
/usr/lib/libreoffice/program/
/usr/lib/libreoffice/program/libnpsoplugin.so
/usr/lib/libreoffice/program/nsplugin
/usr/lib/mozilla/
/usr/lib/mozilla/plugins/
/usr/share/
/usr/share/lintian/
/usr/share/lintian/overrides/
/usr/share/lintian/overrides/browser-plugin-libreoffice
/usr/share/doc/
/usr/share/doc/browser-plugin-libreoffice/
/usr/share/doc/browser-plugin-libreoffice/copyright
/usr/share/bug/
/usr/share/bug/browser-plugin-libreoffice/
/usr/share/bug/browser-plugin-libreoffice/presubj
/usr/lib/mozilla/plugins/libnpsoplugin.so
/usr/share/doc/browser-plugin-libreoffice/README.gz
/usr/share/doc/browser-plugin-libreoffice/changelog.Debian.gz