Examine source code of Netflix Control

{
  "manifest_version": 2,
  "name": "Netflix Control",
  "version": "1.7",
  "description": "control netflix with your keyboard",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.netflix.com/*"
      ],
      "js": [
        "lib/controls.js",
        "lib/utils.js",
        "index.js"
      ]
    }
  ]
}