Examine source code of Quick Reading Time

{
  "manifest_version": 3,
  "name": "Quick Reading Time",
  "version": "1.0.1",
  "description": "Estimate word count and reading time for the current page.",
  "permissions": [
    "activeTab",
    "scripting"
  ],
  "action": {
    "default_title": "Quick Reading Time",
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "quick-reading-time@example.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}