Examine source code of AT Toolkit

{
  "manifest_version": 3,
  "name": "AT Toolkit",
  "description": "An extension to improve the user experience on the AutoTrader UK website.",
  "version": "20230912.1",
  "icons": {
    "16": "Images/icon-16.png",
    "32": "Images/icon-32.png",
    "48": "Images/icon-48.png",
    "128": "Images/icon-128.png"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "Images/icon-16.png",
        "Scripts/harvest.js"
      ],
      "matches": [
        "https://*.autotrader.co.uk/*"
      ]
    }
  ],
  "permissions": [
    "storage"
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "content_scripts": [
    {
      "js": [
        "Scripts/search.js"
      ],
      "matches": [
        "https://*.autotrader.co.uk/*-search?*"
      ]
    },
    {
      "js": [
        "Scripts/listing.js"
      ],
      "matches": [
        "https://*.autotrader.co.uk/*-details/*"
      ]
    },
    {
      "js": [
        "Scripts/retailer.js"
      ],
      "matches": [
        "https://*.autotrader.co.uk/retailer/stock*"
      ]
    }
  ],
  "action": {
    "default_title": "AT Toolkit",
    "default_popup": "options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "attoolkitextension@gmail.com"
    }
  }
}