Examine source code of dragon_of_fire

{
  "theme": {
    "images": {
      "theme_frame": "heat_fdragon.png"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "dragon_of_fire",
  "manifest_version": 2,
  "description": "black background, with a dragon at right of screen and flames all around.\ni hope you like that"
}