Examine source code of Myinstants App

{
  "manifest_version": 3,
  "name": "Myinstants App",
  "short_name": "Myinstants",
  "version": "1.0",
  "description": "Explore a collection of funny sound effects, share them with friends, and create custom sound buttons—all for free!",
  "icons": {
    "16": "icon-36x36.png",
    "48": "icon-48x48.png",
    "128": "icon-128x128.png"
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": "icon-128x128.png"
  },
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "contact@myinstants.us"
    }
  }
}