Examine source code of HTML Class Remover

{
  "manifest_version": 2,
  "name": "HTML Class Remover",
  "version": "1.1",
  "description": "Removes the app-wrapper-web class from web.whatsapp.com",
  "icons": {
    "48": "icons/html-48.png",
    "96": "icons/html-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.whatsapp.com/*"
      ],
      "js": [
        "classRemover.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{8646292c-c6e3-40de-acbf-5042be5a2f7c}"
    }
  }
}