Examine source code of IP Getter

{
  "manifest_version": 2,
  "name": "IP Getter",
  "version": "1.0",
  "description": "Getting the IP address of the site.",
  "homepage_url": "https://github.com/Hazardooo/ip-getter",
  "icons": {
    "48": "icons/icon48.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": {
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    },
    "default_title": "Get site ip",
    "default_popup": "popup/popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1c0575dc-870a-4ecc-a555-713bdeded888}"
    }
  }
}