How to download the Facebook SDK inside a chrome extension

download_fb_sdk.md

window.fbAsyncInit = function() {
      FB.init({
        appId            : '<your-app-id>',
        autoLogAppEvents : true,
        xfbml            : true,
        version          : 'v2.10'
      });

      FB.AppEvents.logPageView();
    };

(function(d, s, id){
  var js, fjs = d.getElementsByTagName(s)[0];
  if (d.getElementById(id)) {return;}
  js = d.createElement(s); js.id = id;
  js.src = "https://connect.facebook.net/en_US/sdk.js";
  fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));