Examine source code of MyMelody Live

{
  "manifest_version": 2,
  "name": "MyMelody Live",
  "version": "2.0.1",
  "description": "Fetch music from your browser to later display it to your audience",
  "icons": {
    "128": "icone128.png"
  },
  "background": {
    "scripts": [
      "browser-polyfill.js",
      "background.js"
    ]
  },
  "permissions": [
    "tabs",
    "storage"
  ],
  "options_ui": {
    "page": "options/options.html",
    "chrome_style": true
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "browser-polyfill.js",
        "get-youtube-timecode.js"
      ]
    }
  ],
  "author": "Isak"
}