Examine source code of Domain Name Search

{
  "name": "Domain Name Search",
  "manifest_version": 2,
  "short_name": "domain",
  "description": "Search Domain Name for your website.",
  "version": "3.10",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "favicon-16x16.png"
  },
  "icons": {
    "128": "domain-hosting128.png"
  }
}