/usr/share/gnome-shell/extensions/ is in gnome-shell-pomodoro-data 0.13.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gnome-shell/extensions/pomodoro@arun.codito.in/
/usr/share/gnome-shell/extensions/pomodoro@arun.codito.in/config.js
/usr/share/gnome-shell/extensions/pomodoro@arun.codito.in/dbus.js
/usr/share/gnome-shell/extensions/pomodoro@arun.codito.in/dialogs.js
/usr/share/gnome-shell/extensions/pomodoro@arun.codito.in/extension.js
/usr/share/gnome-shell/extensions/pomodoro@arun.codito.in/indicator.js
/usr/share/gnome-shell/extensions/pomodoro@arun.codito.in/metadata.json
/usr/share/gnome-shell/extensions/pomodoro@arun.codito.in/notifications.js
/usr/share/gnome-shell/extensions/pomodoro@arun.codito.in/presence.js
/usr/share/gnome-shell/extensions/pomodoro@arun.codito.in/settings.js
/usr/share/gnome-shell/extensions/pomodoro@arun.codito.in/stylesheet.css
/usr/share/gnome-shell/extensions/pomodoro@arun.codito.in/timer.js
/usr/share/gnome-shell/extensions/pomodoro@arun.codito.in/utils.js