Examine source code of Custom Homepage v2

{
  "manifest_version": 2,
  "name": "Custom Homepage",
  "version": "1.0",
  "description": "Set and display a custom homepage with simple customization options.",
  "permissions": [],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e62a7482-aedd-486f-a4b1-6761f7e5f164}"
    }
  }
}