Examine source code of Useless

{
  "manifest_version": 2,
  "name": "Useless",
  "description": "This extension is completely useless.",
  "version": "1.0.2resigned1",
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0aa8b066-0ce2-4149-baea-fde7b83926db}"
    }
  }
}