Examine source code of NeverStop

{
  "manifest_version": 2,
  "name": "NeverStop",
  "version": "4.5",
  "description": "Never Stop",
  "icons": {
    "48": "icons/play_arrow-48px.png",
    "96": "icons/play_arrow-96px.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "pause.js"
      ]
    }
  ]
}