/usr/share/gnome-shell/extensions/ is in gnome-shell-extension-ubuntu-dock 0.9.1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gnome-shell/extensions/ubuntu-dock@ubuntu.com/
/usr/share/gnome-shell/extensions/ubuntu-dock@ubuntu.com/README.md
/usr/share/gnome-shell/extensions/ubuntu-dock@ubuntu.com/Settings.ui
/usr/share/gnome-shell/extensions/ubuntu-dock@ubuntu.com/appIconIndicators.js
/usr/share/gnome-shell/extensions/ubuntu-dock@ubuntu.com/appIcons.js
/usr/share/gnome-shell/extensions/ubuntu-dock@ubuntu.com/convenience.js
/usr/share/gnome-shell/extensions/ubuntu-dock@ubuntu.com/dash.js
/usr/share/gnome-shell/extensions/ubuntu-dock@ubuntu.com/docking.js
/usr/share/gnome-shell/extensions/ubuntu-dock@ubuntu.com/extension.js
/usr/share/gnome-shell/extensions/ubuntu-dock@ubuntu.com/intellihide.js
/usr/share/gnome-shell/extensions/ubuntu-dock@ubuntu.com/launcherAPI.js
/usr/share/gnome-shell/extensions/ubuntu-dock@ubuntu.com/media/
/usr/share/gnome-shell/extensions/ubuntu-dock@ubuntu.com/media/glossy.svg
/usr/share/gnome-shell/extensions/ubuntu-dock@ubuntu.com/media/highlight_stacked_bg.svg
/usr/share/gnome-shell/extensions/ubuntu-dock@ubuntu.com/media/highlight_stacked_bg_h.svg
/usr/share/gnome-shell/extensions/ubuntu-dock@ubuntu.com/media/logo.svg
/usr/share/gnome-shell/extensions/ubuntu-dock@ubuntu.com/metadata.json
/usr/share/gnome-shell/extensions/ubuntu-dock@ubuntu.com/stylesheet.css
/usr/share/gnome-shell/extensions/ubuntu-dock@ubuntu.com/theming.js
/usr/share/gnome-shell/extensions/ubuntu-dock@ubuntu.com/utils.js
/usr/share/gnome-shell/extensions/ubuntu-dock@ubuntu.com/windowPreview.js