Examine source code of WazUP chat

{
  "manifest_version": 2,
  "name": "WazUp",
  "description": "W Integrate Chat",
  "version": "2.0.48",
  "icons": {
    "16": "data/icons/16.png",
    "32": "data/icons/32.png",
    "48": "data/icons/48.png",
    "64": "data/icons/64.png",
    "128": "data/icons/128.png",
    "256": "data/icons/256.png"
  },
  "options_ui": {
    "page": "data/options/index.html",
    "chrome_style": true
  },
  "browser_action": {
    "default_title": "Wischat 2.0"
  },
  "permissions": [
    "alarms",
    "storage",
    "scripting",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "service-worker.js"
    ]
  },
  "content_scripts": [
    {
      "js": [
        "thirdParty/jquery-3.4.1.min.js",
        "thirdParty/purify.min.js",
        "foreground.js",
        "envio_individual.js",
        "integracion_crm.js",
        "xlsx.full.min.js",
        "verificacion_de_numeros.js",
        "logger.js"
      ],
      "matches": [
        "*://*.whatsapp.com/*"
      ],
      "css": [
        "data/inject.css"
      ]
    }
  ],
  "web_accessible_resources": [
    "wapi.js",
    "envio_individual.js",
    "integracion_crm.js",
    "xlsx.full.min.js",
    "verificacion_de_numeros.js",
    "logger.js",
    "data/window/home.svg",
    "data/window/reload.svg",
    "data/window/settings.svg",
    "data/window/clean.svg",
    "data/window/tool.svg"
  ],
  "applications": {
    "gecko": {
      "id": "{16030774-cf62-4cb9-a458-017aeca1bfc6}",
      "strict_min_version": "59.0"
    }
  }
}