Examine source code of NameCombiner Quick Access

{
  "manifest_version": 2,
  "name": "NameCombiner Quick Access",
  "version": "1.0",
  "description": "Quick access to NameCombiner and generate fancy name combinations.",
  "permissions": [],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "applications": {
    "gecko": {
      "id": "fakhraaslam1221@gmail.com"
    }
  }
}