Examine source code of Tab Turner & Rotator Pro

{
  "manifest_version": 2,
  "name": "Tab Turner & Rotator",
  "version": "2.0.7",
  "icons": {
    "16": "images/logo-16.png",
    "32": "images/logo-32.png",
    "48": "images/logo-48.png",
    "128": "images/logo-128.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "images/logo-16.png",
      "32": "images/logo-32.png",
      "48": "images/logo-48.png",
      "128": "images/logo-128.png"
    },
    "default_title": "Tab Turner & Rotator",
    "default_popup": "popup.html"
  },
  "description": "Easily switch between open tabs, perfect for automated slideshows, digital signage, and presentations.",
  "permissions": [
    "storage",
    "idle",
    "alarms"
  ],
  "background": {
    "scripts": [
      "service_worker.js"
    ],
    "persistent": false
  },
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "{1827ea16-66e7-4608-a291-430a5261e00e}"
    }
  }
}