Examine source code of Dark Mode Toggle

{
  "manifest_version": 3,
  "name": "Dark Mode Toggle",
  "version": "1.0",
  "description": "Toggle dark mode on websites.",
  "permissions": [],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon.png",
      "48": "icon.png",
      "128": "icon.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "icons": {
    "16": "icon.png",
    "48": "icon.png",
    "128": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "darkmodetoggle-20240612@private",
      "strict_min_version": "109.0"
    }
  }
}