Examine source code of Blue Geometry 100

{
  "theme": {
    "images": {
      "theme_frame": "Blue_on_Black_01a.jpg"
    },
    "colors": {
      "frame": "#001026",
      "tab_background_text": "#b2d3ff"
    }
  },
  "version": "2.0",
  "name": "Blue Geometry 100",
  "manifest_version": 2,
  "description": "More geometry"
}