Examine source code of WAEVA

{
  "manifest_version": 2,
  "name": "WAEVA",
  "version": "1.21",
  "default_locale": "id",
  "description": "__MSG_appDescription__",
  "permissions": [
    "tabs",
    "storage",
    "downloads",
    "*://web.whatsapp.com/*"
  ],
  "background": {
    "scripts": [
      "background.js",
      "libs/xlsx.full.min.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_title": "Open WAEVA"
  },
  "content_scripts": [
    {
      "matches": [
        "*://web.whatsapp.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "panel.html",
    "modal.js",
    "icons/*",
    "libs/*"
  ],
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f8e22efd-838d-440f-a807-e4935b157908}"
    }
  }
}