Examine source code of no-ip

{
  "manifest_version": 2,
  "name": "no-ip",
  "version": "1.2resigned1",
  "description": "Send ip updates to no-ip.",
  "icons": {
    "48": "icons/border-48.png",
    "96": "icons/border-96.png"
  },
  "background": {
    "scripts": [
      "no-ip.js"
    ]
  },
  "permissions": [
    "https://dynupdate.no-ip.com/nic/update",
    "storage"
  ],
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "applications": {
    "gecko": {
      "id": "no-ip@no-ip.com"
    }
  }
}