Examine source code of Calculator

{
  "manifest_version": 3,
  "name": "Calculator",
  "version": "1.1.2",
  "description": "A simple calculator. Perform quick calculations effortlessly with our sleek and intuitive calculator extension.",
  "author": "Ayush Rana",
  "icons": {
    "64": "icons/icon512 - Copy.png",
    "128": "icons/icon512 - Copy.png",
    "256": "icons/icon512 - Copy.png",
    "512": "icons/icon512 - Copy.png"
  },
  "action": {
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "calculator@example.com",
      "strict_min_version": "91.0"
    }
  },
  "permissions": [
    "storage",
    "declarativeNetRequestWithHostAccess"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_script.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "commands": {
    "open-extension": {
      "suggested_key": {
        "default": "Alt+C",
        "mac": "Alt+C"
      },
      "description": "Open extension"
    }
  }
}