Examine source code of supernova_simple

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#944e4e",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "supernova_simple",
  "manifest_version": 2,
  "description": "This theme is intended for the imaginative user. A simple space related theme for the sci-fi or explorative type.\n\nCreated by GIMP on Linux!"
}