Examine source code of SeikisoViewer

{
  "author": "なかむーら",
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "browser_action": {
    "default_popup": "html/popup.html"
  },
  "content_scripts": [
    {
      "css": [
        "css/style.css",
        "css/jquery-ui.min.css",
        "css/jquery.contextMenu.css"
      ],
      "js": [
        "js/jquery-3.1.1.min.js",
        "js/jquery-ui.min.js",
        "js/jquery.contextMenu.js",
        "js/clipboard.min.js",
        "js/popup.js",
        "js/youtube.js",
        "js/main.js"
      ],
      "matches": [
        "https://*.youtube.com/*",
        "https://www.youtube.com/channel/*/live"
      ]
    },
    {
      "all_frames": true,
      "css": [
        "css/style.css",
        "css/jquery-ui.min.css"
      ],
      "js": [
        "js/jquery-3.1.1.min.js",
        "js/jquery-ui.min.js"
      ],
      "matches": [
        "https://*.youtube.com/live_chat*"
      ],
      "run_at": "document_idle"
    }
  ],
  "description": "YoutubeLiveコメント欄拡張",
  "homepage_url": "http://com.nicovideo.jp/community/co3314651",
  "icons": {
    "128": "images/128.png"
  },
  "manifest_version": 2,
  "name": "SeikisoViewer",
  "options_ui": {
    "chrome_style": true,
    "page": "html/options.html"
  },
  "permissions": [
    "tabs",
    "storage"
  ],
  "version": "0.2.4resigned1",
  "web_accessible_resources": [
    "images/*",
    "sound/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{380c374c-a8db-43cd-8f69-fb106c1e1ff6}"
    }
  }
}