Examine source code of Mouse Trail Drawing

{
  "manifest_version": 2,
  "name": "Mouse Trail Drawing",
  "version": "1.0",
  "description": "Vẽ tự do bằng chuột trên trang web đang xem.",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Mouse Trail Drawing",
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d51b6c65-c5d9-4ac5-8f32-d2c41cf44710}"
    }
  }
}