Examine source code of IP finder

{
  "description": "Find the IP of given website along with other details",
  "manifest_version": 2,
  "name": "IP finder",
  "version": "1.2resigned1",
  "homepage_url": "https://github.com/tsl143/jsDemos/",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "64": "icons/icon.png"
  },
  "page_action": {
    "default_icon": "icons/icon.png",
    "browser_style": true
  },
  "permissions": [
    "tabs",
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e8eeeb64-6348-4156-93d6-2d4831387892}"
    }
  }
}