Examine source code of Flower Password

{
  "description": "花密 Flower Password --- 可记忆的密码管理方案",
  "icons": {
    "16": "img/icon16.png",
    "48": "img/icon48.png",
    "128": "img/icon128.png"
  },
  "manifest_version": 2,
  "name": "Flower Password",
  "version": "1.0",
  "permissions": [
    "contextMenus",
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_icon": {
      "16": "img/icon16.png",
      "48": "img/icon48.png",
      "128": "img/icon128.png"
    },
    "default_title": "花密",
    "default_popup": "passpan.html"
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Alt+I"
      },
      "description": "Insert Password"
    }
  }
}