Examine source code of YouTube Smart Comment Viewer

{
  "update_url" : "https://clients2.google.com/service/update2/crx" ,
  "manifest_version" : 3 ,
  "name" : "__MSG_extName__" ,
  "version" : "3.0",
  "description" : "__MSG_extDesc__" ,
  "default_locale" : "ja" ,
  "permissions" : [
    "storage" 
  ],
  "content_scripts" : [
    {
      "matches" : [
        "*://*.youtube.com/*" 
      ],
      "css" : [
        "styles.css" 
      ],
      "js" : [
        "content.js" 
      ],
      "run_at" : "document_end" 
    }
  ],
  "host_permissions" : [
    "*://*.youtube.com/*" ,
    "*://i.ytimg.com/*" 
  ],
  "icons" : {
    "128" : "icons/icon128.png"
  },
  "web_accessible_resources" : [
    {
      "resources" : [
        "_locales/*/messages.json" 
      ],
      "matches" : [
        "*://*.youtube.com/*" 
      ]
    }
  ]
}