Examine source code of Ticket reserver

{
  "manifest_version": 3,
  "version": "1.4.11",
  "name": "Ticket reserver",
  "description": "An extension for reserving tickets in Kide.app",
  "action": {
    "default_popup": "popup.html"
  },
  "permissions": [
    "activeTab",
    "scripting"
  ],
  "host_permissions": [
    "https://kide.app/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "aapolaakkio@outlook.com"
    }
  }
}