Examine source code of Kitchen Konverter

{
  "browser_specific_settings": {
    "gecko": {
      "id": "enalindstrom@gmail.com"
    }
  },
  "manifest_version": 3,
  "name": "Kitchen Konverter",
  "version": "2.7",
  "description": "The ultimate extension for effortless cooking. Instantly switch between U.S. and metric measurements, perfecting every recipe",
  "author": "Elias Lindström",
  "permissions": [
    "storage",
    "activeTab"
  ],
  "icons": {
    "16": "icon/16x16.png",
    "32": "icon/32x32.png",
    "48": "icon/48x48.png",
    "128": "icon/128x128.png",
    "1024": "icon/1024x1024.png"
  },
  "content_scripts": [
    {
      "js": [
        "scripts/bundle.js"
      ],
      "matches": [
        "*://*/*"
      ]
    }
  ],
  "action": {
    "default_popup": "index.html"
  }
}