Examine source code of WebTester

{
  "manifest_version": 2,
  "name": "WebTester",
  "version": "1.0",
  "author": "Zer0droid",
  "default_locale": "en",
  "description": "WebTester is a simple add-on to Firefox that helps pentesters, bug-bounty hunters and CTF Players to test most common and powerful payloads for the most common injection vulnerabilities.",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/icon-48.png",
    "default_title": "webTester",
    "default_popup": "panel/panel.html"
  }
}