Examine source code of Ovrlay

{
  "manifest_version": 2,
  "version": "1.0.2",
  "name": "Ovrlay",
  "description": "Broadcast the currently playing song to the overlay.zusor.io servers and use that info for the OBS overlay",
  "page_action": {
    "default_title": "Ovrlay settings",
    "default_popup": "popup/Popup.html",
    "default_icon": "icons/512.png"
  },
  "background": {
    "scripts": [
      "./socket.io.js",
      "./Emitter.js"
    ],
    "persistent": true
  },
  "permissions": [
    "storage"
  ],
  "icons": {
    "512": "icons/512.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "include_globs": [
        "*://soundcloud.*/*"
      ],
      "js": [
        "./Extractor.js",
        "./websites/soundcloud.js"
      ]
    },
    {
      "matches": [
        "*://*/*"
      ],
      "include_globs": [
        "*://www.youtube.*/*"
      ],
      "js": [
        "./Extractor.js",
        "./websites/youtube.js"
      ]
    },
    {
      "matches": [
        "*://*/*"
      ],
      "include_globs": [
        "*://music.youtube.*/*"
      ],
      "js": [
        "./Extractor.js",
        "./websites/youtube-music.js"
      ]
    },
    {
      "matches": [
        "*://*/*"
      ],
      "include_globs": [
        "*://www.pandora.*/*"
      ],
      "js": [
        "./Extractor.js",
        "./websites/pandora.js"
      ]
    }
  ]
}