Examine source code of YTshepherd

{
  "manifest_version": 2,
  "name": "YTshepherd",
  "version": "1.0",
  "description": "preventing being lost on youtube by don't allowing acces to the main page",
  "icons": {
    "48": "icons/YTshepherd.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "YTshepherd.js"
      ]
    }
  ]
}