Examine source code of Tab Rotator for Dashboards & Kiosks

{
  "update_url" : "https://clients2.google.com/service/update2/crx" ,
  "manifest_version" : 3 ,
  "name" : "__MSG_appName__" ,
  "description" : "__MSG_appDesc__" ,
  "version" : "0.9.12",
  "default_locale" : "en" ,
  "icons" : {
    "16" : "assets/icon16.png",
    "32" : "assets/icon32.png",
    "48" : "assets/icon48.png",
    "128" : "assets/icon128.png"
  },
  "action" : {
    "default_title" : "__MSG_appName__" ,
    "default_popup" : "popup.html"
  },
  "background" : {
    "service_worker" : "background.js" 
  },
  "content_security_policy" : {
    "extension_pages": "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data: blob:; font-src 'self' data:; object-src 'none'"
  },
  "permissions" : [
    "tabs" ,
    "storage" ,
    "offscreen" ,
    "alarms" 
  ],
  "optional_permissions" : [
    "power" 
  ],
  "options_page" : "index.html" 
}