Examine source code of PostureMinder

{
  "name": "PostureMinder",
  "version": "2.1.3",
  "manifest_version": 3,
  "author": "Sheryl Lun",
  "description": "Reminds you to sit up straight with pop-up notifications at specified time intervals.",
  "icons": {
    "128": "img/spine.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "support@postureminder.app"
    }
  },
  "permissions": [
    "alarms",
    "notifications",
    "storage"
  ],
  "background": {
    "scripts": [
      "service_worker.js"
    ],
    "type": "module"
  },
  "action": {
    "default_title": "PostureMinder",
    "default_icon": "img/spine.png",
    "default_popup": "popout.html"
  }
}