Examine source code of Website IP Map

{
  "name": "Website IP Map",
  "version": "1.1.1",
  "manifest_version": 2,
  "description": "See your IP address and the IP address of the website you are visiting on a map.",
  "icons": {
    "128": "icon.png"
  },
  "browser_action": {
    "default_icon": "map_magnify.png",
    "default_popup": "index.html",
    "default_title": "IP Map"
  },
  "permissions": [
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{972f1e58-b1d2-4e0f-a0cb-6fd98ba19eb5}"
    }
  }
}