Examine source code of Riddler

{
  "manifest_version": 3,
  "name": "Riddler",
  "description": "Browser extension for Riddler, the online riddle enhancer.",
  "version": "0.6.6",
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "permissions": [
    "webRequest",
    "webRequestAuthProvider"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_icon": "images/letter-r-32.png",
    "default_title": "Riddler",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "thirdParty/jquery.min.js",
        "credentials.js"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "matches": [
        "<all_urls>"
      ],
      "resources": [
        "credentials.css",
        "credentials.html",
        "fonts/*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f91c9d12-dc58-40cf-bb34-8bf56bb9d6a2}",
      "strict_min_version": "128.0"
    }
  }
}