Examine source code of Exoplanet Night View

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#0f0000",
      "tab_background_text": "#fcf2eb"
    }
  },
  "version": "2.0",
  "name": "Exoplanet Night View",
  "manifest_version": 2,
  "description": "Night Scene on another Earth"
}