Examine source code of Get My IP AZ

{
  "name": "Get My IP One Click",
  "description": "Get your IP with one click whenever you need it, no shenanigan and backflips just to get your external IP.",
  "version": "1.0.2",
  "manifest_version": 2,
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "permissions": [
    "https://api.myip.com/"
  ],
  "author": "Youba Amj",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "web_accessible_resources": [
    "icon16.png",
    "icon48.png",
    "icon128.png",
    "popup.html"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{8e6ccac3-536a-44be-a653-c4698a2b0b32}"
    }
  }
}