Examine source code of Youtube Connect

{
  "manifest_version": 2,
  "name": "Youtube Connect",
  "version": "0.1.2",
  "author": "Ameya Thakur",
  "homepage_url": "https://youtubeconnect.ameyathakur.com",
  "description": "Control Youtube with other devices.",
  "content_security_policy": "default-src 'self'",
  "icons": {
    "48": "icons/icon.png",
    "96": "icons/icon@2x.png",
    "128": "icons/packageicon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "browser-polyfill.min.js",
        "wordlist.js",
        "ytconnect.js"
      ],
      "css": [
        "styles.css"
      ]
    }
  ],
  "permissions": [
    "storage",
    "https://api.youtubeconnect.ameyathakur.com/*"
  ]
}