Examine source code of Custom Search Engine v2

{
  "manifest_version": 2,
  "name": "Custom Search Engine",
  "version": "1.0",
  "description": "Quickly search your favorite search engine from any page.",
  "permissions": [
    "tabs"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icons/icon.png"
  },
  "icons": {
    "48": "icons/icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e8324fe3-4f0f-47fd-a520-d12282114749}"
    }
  }
}