Examine source code of SEO Meta Viewer

{
  "manifest_version": 3,
  "name": "SEO Meta Viewer",
  "version": "1.0",
  "description": "View title, meta description, URL and H1 tags of current page",
  "action": {
    "default_popup": "popup.html"
  },
  "permissions": [
    "activeTab",
    "scripting"
  ],
  "icons": {
    "48": "icon48.png",
    "96": "icon96.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "seo-meta-viewer@addon.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}