Examine source code of Grand Prismatic

{
  "theme": {
    "images": {
      "theme_frame": "GrandPrismaticSpringatYellowstone.jpg"
    },
    "colors": {
      "frame": "#ebf283",
      "tab_background_text": "#2b449c"
    }
  },
  "version": "2.0",
  "name": "Grand Prismatic",
  "manifest_version": 2,
  "description": "Grand Prismatic Spring at Yellowstone National Park, Wyoming, USA"
}