Examine source code of Show Server IP

{
  "manifest_version": 2,
  "name": "Show Server IP",
  "version": "2.4resigned1",
  "description": "Show the IPs that were queried in loading the Site.",
  "icons": {
    "64": "icons/ip.png"
  },
  "permissions": [
    "tabs",
    "webRequest",
    "<all_urls>"
  ],
  "browser_action": {
    "default_icon": "icons/ip.png",
    "default_title": "Chill out"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ad00526a-7680-4840-b361-08a71d44060f}"
    }
  }
}