Examine source code of Work-n-Wapp

{
  "manifest_version": 2,
  "name": "Work-n-Wapp",
  "version": "1.0",
  "description": "Mozilla add-on that lets you integrate whatsapp into your work environment",
  "icons": {
    "48": "icons/Work-n-Wapp-48.png",
    "96": "icons/Work-n-Wapp-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "wappify.js"
      ]
    }
  ]
}