Calculator

manifest.json

{
  "manifest_version": 2,
  "name": "Calculator",
  "description": "This is a normal Calculator.",
  "version": "1.0",
  "browser_action": {
    "default_icon": "images/icon.png",
    "default_popup": "popup.html",
    "default_title": "Calculator"
  },
  "update_url": "https://edge.microsoft.com/extensionwebstorebase/v1/crx"
}