Examine source code of Quick Dark Mode Toggle

{
  "manifest_version": 3,
  "name": "Quick Dark Mode Toggle",
  "version": "1.0",
  "description": "Toggle dark mode for websites with one click",
  "permissions": [
    "scripting",
    "activeTab"
  ],
  "action": {
    "default_icon": "icon.png",
    "default_title": "Toggle Dark Mode"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "quick-dark-mode-toggle-16d65fb6@example.com"
    }
  }
}