This extension provides integration with GNOME Shell and the corresponding extensions repository https://extensions.gnome.org
You MUST install native connector for this extension to work.
For Arch Linux, Debian, Fedora, Gentoo and Ubuntu you can install package named "chrome-gnome-shell".
You also can install connector manually. See https://wiki.gnome.org/Projects/GnomeShellIntegrationForChrome/Installation for install instructions.