Examine source code of Long Beach

{
  "theme": {
    "images": {
      "theme_frame": "hammock.jpg"
    },
    "colors": {
      "frame": "#95bdcf",
      "tab_background_text": "#380000"
    }
  },
  "version": "2.0",
  "name": "Long Beach",
  "manifest_version": 2,
  "description": "A bikini model relaxes in a hammock on a beach. This photo was obtained from a royalty-free photo site, and formatted to fit the dimensions of a Firefox persona."
}