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.