Examine source code of VodSync.tv - Twitch Player Extension

{
  "manifest_version": 2,
  "name": "VodSync.tv - Twitch Player Extension",
  "version": "1.1",
  "icons": {
    "16": "assets/icons/favicon-16.png",
    "32": "assets/icons/favicon-32.png",
    "48": "assets/icons/favicon-48.png",
    "128": "assets/icons/favicon-128.png"
  },
  "description": "Effortlessly match the exact moment in the VOD or clip you are watching with another streamer's perspective.",
  "homepage_url": "https://vodsync.tv",
  "short_name": "VodSync",
  "permissions": [
    "https://api.vodsync.tv/*"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "author": "VodSync.Tv",
  "applications": {
    "gecko": {
      "id": "{95cf8d78-2501-4a07-a2a3-2be4a6ac2789}"
    }
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "assets/icons/favicon-16.png",
      "32": "assets/icons/favicon-32.png",
      "48": "assets/icons/favicon-48.png",
      "128": "assets/icons/favicon-128.png"
    },
    "default_title": "vodsync",
    "browser_style": false
  },
  "background": {
    "scripts": [
      "js/background.bundle.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "http://twitch.tv/*",
        "https://twitch.tv/*",
        "http://clips.twitch.tv/*",
        "https://clips.twitch.tv/*",
        "http://www.twitch.tv/*",
        "https://www.twitch.tv/*"
      ],
      "js": [
        "js/contentScript.bundle.js"
      ],
      "css": [
        "css/contentScript.css"
      ]
    }
  ]
}