Examine source code of Auto Refresh Advanced

{
  "manifest_version": 2,
  "name": "Auto Refresh Advanced",
  "version": "3.0",
  "description": "Advanced auto-refresh tool with random intervals, notifications, and more.",
  "permissions": [
    "activeTab",
    "storage",
    "tabs",
    "notifications",
    "alarms"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "icons": {
    "48": "icon.png",
    "128": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3fc88d62-2573-4d57-95bb-cf5d2c00ceb8}"
    }
  }
}