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Sets a selected set of localStorage variables for all loaded urls This extension's purpose is sharing cross domain data by exposing a key/pair popup editor. By adding/removing new pairs, you will, under the hood, set your window.localStorage.cross_domain_localstorage to a key/value pairs object. In order to use the values set in the extension's popup - from your JS app consume the window.localStorage.cross_domain_localstorage.name_of_key.
rating_count is the Chrome Web Store ratings count, not a written-review count.