Examine source code of Site Security Toolkit

{
  "manifest_version": 2,
  "name": "Site Security Toolkit",
  "version": "0.8",
  "developer": {
    "name": "Carl Clegg",
    "url": "https://github.com/i-am-cjc/security-addon"
  },
  "icons": {
    "48": "icon.svg",
    "96": "icon.svg"
  },
  "description": "Adds an entry to the context menu to scan the current site with various online services.",
  "permissions": [
    "contextMenus",
    "tabs",
    "*://dns.google.com/*",
    "webRequest"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}