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A shortcut to the list of Chrome URLs (chrome://about) This is just a shortcut to Chrome "about" page - the one that lists all internal Chrome URLs. It's just a button that will be added to the Chrome apps list (and will be visible in Chrome App Launcher too). Click on the icon and you'll open the "chrome://about" page. That's all this shortcut does...
rating_count is the Chrome Web Store ratings count, not a written-review count.