Examine source code of WP Engine Cache Inspector

{
  "manifest_version": 3,
  "name": "WP Engine Cache Inspector",
  "version": "1.3.0",
  "description": "Shows WP Engine and HTTP cache status, age, TTL, bypass reasons, and relevant response headers for the current page.",
  "browser_specific_settings": {
    "gecko": {
      "id": "wp-engine-cache-inspector@addon",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "webRequest",
    "tabs",
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "service-worker-loader.js"
    ],
    "type": "module"
  },
  "action": {
    "default_title": "WP Engine Cache Inspector",
    "default_popup": "src/popup.html"
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  }
}