/usr/lib/libreoffice/share/extensions/ is in libreoffice-lightproof-en 0.4.3+1.5+git20140515-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/libreoffice/share/extensions/lightproof_en/
/usr/lib/libreoffice/share/extensions/lightproof_en/Lightproof.py
/usr/lib/libreoffice/share/extensions/lightproof_en/Linguistic.xcu
/usr/lib/libreoffice/share/extensions/lightproof_en/META-INF/
/usr/lib/libreoffice/share/extensions/lightproof_en/META-INF/manifest.xml
/usr/lib/libreoffice/share/extensions/lightproof_en/README_lightproof_en.txt
/usr/lib/libreoffice/share/extensions/lightproof_en/description.xml
/usr/lib/libreoffice/share/extensions/lightproof_en/dialog/
/usr/lib/libreoffice/share/extensions/lightproof_en/dialog/OptionsDialog.xcs
/usr/lib/libreoffice/share/extensions/lightproof_en/dialog/OptionsDialog.xcu
/usr/lib/libreoffice/share/extensions/lightproof_en/dialog/en.xdl
/usr/lib/libreoffice/share/extensions/lightproof_en/dialog/en_en_US.default
/usr/lib/libreoffice/share/extensions/lightproof_en/dialog/en_en_US.properties
/usr/lib/libreoffice/share/extensions/lightproof_en/pythonpath/
/usr/lib/libreoffice/share/extensions/lightproof_en/pythonpath/lightproof_handler_lightproof_en.py
/usr/lib/libreoffice/share/extensions/lightproof_en/pythonpath/lightproof_impl_lightproof_en.py
/usr/lib/libreoffice/share/extensions/lightproof_en/pythonpath/lightproof_lightproof_en.py
/usr/lib/libreoffice/share/extensions/lightproof_en/pythonpath/lightproof_opts_lightproof_en.py