Examine source code of Auto Dark Mode

{
  "manifest_version": 2,
  "name": "Auto Dark Mode",
  "version": "1.0",
  "description": "Automatically switch to dark mode based on time or ambient light.",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "48": "icons/dark-mode-48.png",
    "128": "icons/dark-mode-128.png"
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/dark-mode-48.png"
    },
    "default_title": "Auto Dark Mode"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c0457aeb-8317-4236-8cf0-e700c9f1e9e3}"
    }
  }
}