Examine source code of Unit Converter Profesional

{
  "manifest_version": 2,
  "name": "Unit Converter Pro",
  "version": "3.1",
  "description": "A fast all-in-one unit converter: length, mass, temperature, volume, area, speed, time and digital storage. See the result and every other unit at once. Works offline.",
  "icons": {
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "64": "icons/icon-64.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{61d4be99-b28c-4cc4-b361-d892a5311d6c}",
      "strict_min_version": "101.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_title": "Unit Converter Pro",
    "default_popup": "src/popup.html",
    "default_icon": {
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "64": "icons/icon-64.png"
    }
  }
}