Examine source code of UK Test Booking Helper

{
  "manifest_version": 3,
  "name": "UK Test Booking Helper",
  "version": "1.0.0",
  "description": "Watches the DVSA driving-test booking pages in your own session and alerts you when an earlier cancellation slot appears. Notify & highlight only — no auto-booking.",
  "browser_specific_settings": {
    "gecko": {
      "id": "uk-test-booking-helper@example.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "permissions": [
    "storage",
    "alarms",
    "notifications"
  ],
  "host_permissions": [
    "https://driverpracticaltest.dvsa.gov.uk/*",
    "https://driverpracticaltheorytest.dvsa.gov.uk/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://driverpracticaltest.dvsa.gov.uk/*",
        "https://driverpracticaltheorytest.dvsa.gov.uk/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "action": {
    "default_title": "UK Test Booking Helper",
    "default_popup": "popup/popup.html",
    "default_icon": "icons/icon.svg"
  },
  "icons": {
    "48": "icons/icon.svg",
    "128": "icons/icon.svg"
  }
}