Examine source code of Ecommerce Link Cleaner

{
  "manifest_version": 2,
  "name": "Ecommerce Link Cleaner",
  "version": "1.0.0",
  "description": "Remove tracking parameters from Mercado Livre and Amazon URLs and copy clean, direct links to your clipboard",
  "browser_specific_settings": {
    "gecko": {
      "id": "firefox@kittentechnologies.com"
    }
  },
  "permissions": [
    "activeTab",
    "clipboardWrite",
    "contextMenus",
    "*://*.mercadolivre.com.br/*",
    "*://*.mercadolibre.com/*",
    "*://*.amazon.com/*",
    "*://*.amazon.com.br/*",
    "*://*.amazon.ca/*",
    "*://*.amazon.co.uk/*",
    "*://*.amazon.de/*",
    "*://*.amazon.fr/*",
    "*://*.amazon.it/*",
    "*://*.amazon.es/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.mercadolivre.com.br/*",
        "*://*.mercadolibre.com/*",
        "*://*.amazon.com/*",
        "*://*.amazon.com.br/*",
        "*://*.amazon.ca/*",
        "*://*.amazon.co.uk/*",
        "*://*.amazon.de/*",
        "*://*.amazon.fr/*",
        "*://*.amazon.it/*",
        "*://*.amazon.es/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  }
}