Examine source code of Leads R us

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Leads tracker",
  "action": {
    "default_popup": "index.html",
    "default_icon": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{04066a1e-94e1-43b5-a345-9ca5fe04b06a}"
    }
  }
}