Examine source code of arabKey tools

{
  "name": "arabKey tools",
  "description": "a set of tools for arabic language",
  "version": "1.0",
  "version_name": "1.0 beta",
  "author": "Ashraf Monshi",
  "manifest_version": 2,
  "browser_action": {
    "default_icon": "images/icon.png",
    "default_popup": "popup.html",
    "default_title": "convert numbers to arabic letters"
  },
  "permissions": [
    "*://*.arakey.test//*"
  ]
}