Examine source code of Chatwork INPUT NOW

{
  "manifest_version": 2,
  "name": "Chatwork INPUT NOW",
  "short_name": "Chatwork INPUT NOW",
  "description": "Chatwork用の入力支援ツール：[info][title][code][hr]タグの挿入、日付の挿入、タグの削除ができるFireFoxアドオン。",
  "version": "0.7.3",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.chatwork.com/*"
      ],
      "js": [
        "jquery-3.2.1.min.js",
        "content.js"
      ],
      "css": [
        "style.css"
      ]
    }
  ],
  "browser_action": {
    "default_icon": "icons/icon48.png",
    "default_title": ""
  },
  "permissions": [
    "https://www.chatwork.com/*"
  ]
}