Examine source code of Hansel

{
  "short_name": "Hansel",
  "name": "Hansel",
  "version": "2.0.0.12",
  "version_name": "2.0.0.12",
  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAubCh2ixHudpJX4Ey6LhIFc8KFWqNRAGozhW0Hjs3h50RqKph77UtylndGcGD3ZhU1b9Saszd+9hIOGsAwcYlXe3GgJQxUAzCfKiBnAZ5jK4F1/Mt0chra6k6i6Y+FRFrSXUEDU0UDkHdq6DhFRZ6oLWeR26ZVUdXl/CvdBPGgqIv+nIYO5mMlYxyCYqX0j3/53XNnn+yoXyNcdNRLfTfoQac7Jqbc1uwiB+5x7EaXbOgH/NOAh50Dyu47pkhZlZJcX5eqCw3igKrs6/FGzBmLG3uTFyLVoeYdXEJg0Hb+IkWUltkzVVtZKEkz48AJYq0MvE5hJNlFRq9XNbQzEDqfQIDAQAB",
  "description": "Buy Better With Hansel",
  "icons": {
    "16": "/assets/hansel-ico.png",
    "48": "/assets/hansel-ico.png",
    "128": "/assets/hansel-ico.png"
  },
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'",
  "permissions": [
    "activeTab",
    "storage",
    "<all_urls>"
  ],
  "manifest_version": 2,
  "background": {
    "persistent": false,
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Hansel",
    "default_icon": "/assets/hansel-ico.png",
    "default_popup": "popup.html"
  },
  "externally_connectable": {
    "matches": [
      "http://localhost:3000/*",
      "http://localhost:3001/*",
      "https://console.gethansel.com/*"
    ]
  },
  "web_accessible_resources": [
    "assets/*.svg"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "banner.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f197c40a-e57b-4f36-8642-9cd660a7ffb6}"
    }
  }
}