Examine source code of Exploding Sun

{
  "theme": {
    "images": {
      "theme_frame": "supernova.jpg"
    },
    "colors": {
      "frame": "#211f1f",
      "tab_background_text": "#ede6e6"
    }
  },
  "version": "2.0",
  "name": "Exploding Sun",
  "manifest_version": 2,
  "description": "A starry sky with a sun gone supernova."
}