CMS Detect - What CMS is that site using?

manifest.json

{
  "manifest_version": 2,
  "name": "CMS Detect - What CMS is that site using?",
  "short_name": "CMS Detect",
  "version": "0.1",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "jquery.min.js",
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "background": {
    "page": "background.html"
  },
  "browser_action": {
    "default_icon": {
      "19": "icon.png",
      "38": "icon38.png"
    },
    "default_popup": "Popup.html"
  },
  "permissions": [
    "tabs"
  ],
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'",
  "update_url": "https://edge.microsoft.com/extensionwebstorebase/v1/crx"
}