Examine source code of Basic Calculator

{
  "action": {
    "default_popup": "popup.html"
  },
  "author": "Furkan Doğan",
  "default_locale": "en",
  "description": "__MSG_extensionDescription__",
  "icons": {
    "128": "icon.png"
  },
  "manifest_version": 3,
  "name": "__MSG_extensionName__",
  "version": "1.2.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "basic-calculator-from-1furkandogan1@gmail.com"
    }
  }
}