Examine source code of DDB Cobalt Copier

{
  "manifest_version": 3,
  "name": "DDB Cobalt Copier",
  "version": "1.0.2",
  "description": "Copy the D&D Beyond CobaltSession cookie value to the clipboard.",
  "browser_specific_settings": {
    "gecko": {
      "id": "ddb-cobalt-copier@example.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "action": {
    "default_title": "Copy DDB CobaltSession",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    },
    "default_popup": "popup.html"
  },
  "permissions": [
    "cookies",
    "clipboardWrite"
  ],
  "host_permissions": [
    "https://*.dndbeyond.com/*"
  ]
}