Examine source code of hextabs

{
  "manifest_version": 2,
  "name": "hextabs",
  "version": "1.0.2resigned1",
  "description": "Makes new tabs display a random color and its associated hex.",
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b2234727-b59b-436a-b7b5-fb876986db9a}"
    }
  }
}