Examine source code of Fun with color

{
  "theme": {
    "images": {
      "theme_frame": "color.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Fun with color",
  "manifest_version": 2,
  "description": "Watercolors pink, orange, yellow, green and white mixed."
}