Examine source code of IP

{
  "manifest_version": 2,
  "name": "Show IP",
  "version": "1.2",
  "description": "Displays your public IP address in a minimal popup and shows location on hover.",
  "icons": {
    "48": "icons/icon-128.png",
    "128": "icons/icon-128.png"
  },
  "browser_action": {
    "default_title": "Show IP",
    "default_icon": "icons/icon-128.png",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "storage",
    "alarms"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{fa21aa11-0f1d-4be0-a192-28a52a3b4969}"
    }
  }
}