Examine source code of Calculator — Quick Popup

{
  "manifest_version": 3,
  "name": "Calculator — Quick Popup",
  "description": "A clean, keyboard-friendly calculator in your toolbar.",
  "version": "1.0.0",
  "action": {
    "default_title": "Calculator",
    "default_popup": "popup.html"
  },
  "permissions": [
    "storage"
  ],
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "calculator-quick-popup@example.com",
      "strict_min_version": "109.0"
    }
  }
}