Examine source code of YouTube comments killer

{
  "manifest_version": 2,
  "name": "YouTube comments killer",
  "short_name": "ComKill",
  "version": "1.2",
  "description": "Removes the whole comment section under all YouTube videos.",
  "permissions": [
    "activeTab"
  ],
  "icons": {
    "32": "icon/32.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ]
}