/usr/share/gnome-shell/extensions/ is in gnome-shell-extension-dashtodock 55-4.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/Settings.ui
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/appIcons.js
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/convenience.js
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/dash.js
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/docking.js
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/extension.js
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/intellihide.js
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/locale/
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/locale/ar.po
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/locale/cs.po
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/locale/de.po
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/locale/es.po
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/locale/fr.po
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/locale/hu.po
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/locale/it.po
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/locale/ja.po
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/locale/nl.po
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/locale/pl.po
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/locale/pt.po
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/locale/pt_BR.po
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/locale/ru.po
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/locale/sk.po
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/locale/sr.po
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/locale/sr@latin.po
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/locale/sv.po
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/locale/tr.po
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/locale/zh_CN.po
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/media/
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/media/logo.svg
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/media/screenshot.jpg
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/metadata.json
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/prefs.js
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/schemas/
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/schemas/gschemas.compiled
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/schemas/org.gnome.shell.extensions.dash-to-dock.gschema.xml
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/stylesheet.css
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/theming.js