Examine source code of AliTaxCalc

{
  "manifest_version": 2,
  "name": "AliTaxCalc",
  "version": "1.5",
  "description": "shows approximate tax for chilean purchases in aliexpress + some useful tweaks",
  "icons": {
    "48": "icons/border-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.aliexpress.com/p/shoppingcart/*",
        "*://*.aliexpress.com/item/*",
        "*://*.aliexpress.com/w/*",
        "*://*.aliexpress.ru/p/shoppingcart/*",
        "*://*.aliexpress.ru/item/*",
        "*://*.aliexpress.ru/w/*"
      ],
      "js": [
        "main.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "websiteContent"
        ]
      },
      "id": "shironeko@alitaxcalc"
    }
  }
}