Examine source code of Uncommon Ground

{
  "theme": {
    "images": {
      "theme_frame": "thelittlewhitespotheader.jpg"
    },
    "colors": {
      "frame": "#e6d6d6",
      "tab_background_text": "#fcf9f9"
    }
  },
  "version": "2.0",
  "name": "Uncommon Ground",
  "manifest_version": 2,
  "description": "tiny piece of swirled fractal"
}