Examine source code of Auto Dark Mode V2

{
  "manifest_version": 2,
  "name": "Auto Dark Mode V2",
  "version": "1.3",
  "description": "Automatically enables dark mode based on time or system theme.",
  "permissions": [
    "tabs",
    "storage",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+D"
      },
      "description": "Toggle dark mode on current site"
    }
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "browser_action": {
    "default_icon": "icons/logo_64.png",
    "default_title": "Auto Dark Mode",
    "default_popup": "popup.html"
  },
  "icons": {
    "32": "icons/logo_32.png",
    "64": "icons/logo_64.png",
    "128": "icons/logo_128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d5c07ef5-5387-4eab-9f53-0d38433431b5}"
    }
  }
}