Examine source code of Simple Youtube controller

{
  "description": "Simple Youtube player controller",
  "manifest_version": 2,
  "name": "Youtube controller",
  "version": "1.42",
  "permissions": [
    "tabs"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_action": {
    "browser_style": true,
    "default_popup": "popup/choose_page.html",
    "default_icon": {
      "512": "icon/logo.png"
    }
  }
}