Examine source code of Mozilla Labs Refresh

{
  "theme": {
    "images": {
      "theme_frame": "header6.png"
    },
    "colors": {
      "frame": "#d5dde0",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Mozilla Labs Refresh",
  "manifest_version": 2,
  "description": "Laboratories are where science and creativity meet to develop, research, and explore new ideas. Mozilla Labs embraces this great tradition — a virtual lab where people come together to create, experiment, and play with new Web innovations and technologies."
}