Examine source code of Advanced Auto Refresh

{
  "manifest_version": 2,
  "name": "Advanced Auto Refresh",
  "version": "2.2",
  "description": "Advanced auto-refresh with multiple URL support and customizable options",
  "permissions": [
    "tabs",
    "storage",
    "activeTab",
    "notifications",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "options_ui": {
    "page": "options/options.html",
    "browser_style": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0720ca7d-833c-412f-b82b-cea52d154e00}"
    }
  }
}