Examine source code of Dark Mode Toggle

{
  "manifest_version": 2,
  "name": "Dark Mode Toggle",
  "version": "1.0",
  "description": "Bật/tắt chế độ tối trên bất kỳ trang web nào.",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "activeTab",
    "scripting"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Toggle Dark Mode",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    "background.js"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{56aeb6f1-82d7-48fb-bfd8-9f3e5edfeefa}"
    }
  }
}