Examine source code of Auto theme switcher

{
  "manifest_version": 3,
  "name": "Auto theme switcher",
  "version": "2.4.0",
  "description": "Change the theme for day and night using time or automatic mode.",
  "icons": {
    "512": "icon512x512.png"
  },
  "permissions": [
    "management",
    "storage",
    "activeTab"
  ],
  "action": {
    "default_popup": "options.html",
    "default_icon": {
      "512": "icon512x512.png"
    }
  },
  "content_scripts": [
    {
      "js": [
        "script.js"
      ],
      "matches": [
        "<all_urls>",
        "*://*/*"
      ],
      "run_at": "document_end",
      "all_frames": false
    }
  ],
  "background": {
    "scripts": [
      "worker.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "auto-theme-switcher-8@example.com",
      "strict_min_version": "132.0"
    }
  }
}