Examine source code of Mini Calcula1tor

{
  "manifest_version": 2,
  "name": "Mini Calculator",
  "version": "1.0",
  "description": "A simple popup calculator for quick math operations.",
  "permissions": [
    "clipboardWrite",
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "128": "icon128.png"
    }
  },
  "icons": {
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a2f9a998-6d0f-404a-9d56-e835bd528b0f}"
    }
  }
}