Examine source code of Turtle Heaven

{
  "theme": {
    "images": {
      "theme_frame": "TurtleheavenHeader.jpg"
    },
    "colors": {
      "frame": "#8c1e1e",
      "tab_background_text": "#26233d"
    }
  },
  "version": "2.0",
  "name": "Turtle Heaven",
  "manifest_version": 2,
  "description": "Turtles and fish at the Denver Aquarium"
}