Examine source code of Neuto Browser Extension

{
  "name": "Neuto Browser Extension",
  "version": "0.0.3",
  "description": "Measure your carbon emissions whilst you browse the web.",
  "manifest_version": 3,
  "author": "Neuto",
  "browser_specific_settings": {
    "gecko": {
      "id": "alex@neuto.co.uk",
      "strict_min_version": "42.0"
    }
  },
  "permissions": [
    "activeTab",
    "storage",
    "webRequest"
  ],
  "host_permissions": [
    "https://*/*"
  ],
  "action": {
    "default_popup": "index.html",
    "default_title": "Neuto Website Carbon Emissions",
    "default_icon": {
      "16": "images/icon16.png",
      "24": "images/icon24.png",
      "32": "images/icon32.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}