Examine source code of WebApp Form Filler

{
  "background": {
    "persistent": false,
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "images/icon16.png",
      "32": "images/icon32.png",
      "48": "images/icon48.png",
      "128": "images/icon128.png"
    },
    "default_popup": "popup.html"
  },
  "description": "Automatically fills forms in your web applications. Especially handy for manual testing and development.",
  "icons": {
    "16": "images/icon16.png",
    "32": "images/icon32.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAglpvNf4bDvWOE5rupaZ6Radg6awmpIwOwUSnyMkMOv4BBn4ndhkR769KUONQdkxQCs/PL3nGSY/8SjRNc9qOXF76dan/ZG/NEi3lDtvtulBliYyH4kVovY6DFvaQDjImbXS/+50GMPWUy1oGzHA/xZn59QspVZehDNtgy/vJHEmL2SBvGNzxxh4OA0KPLOFey+HuhoUi6ihqD+md7l1olUw39GQHC3sGAxbUEDaMLxAFuC9IG0dDdli0P8ojgaQc137DASwhx6GnVC9ImLa3bOCk3Hl0FTdddlXhSMMnPM9/w+BPwSaZvA2y8h9AoELyrkTmkoysS7ZSIQPbYmgrMwIDAQAB",
  "manifest_version": 2,
  "name": "WebApp Form Filler",
  "options_page": "options.html",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "short_name": "WAFF",
  "update_url": "https://clients2.google.com/service/update2/crx",
  "version": "0.0.8"
}