Examine source code of BluNebula

{
  "theme": {
    "images": {
      "theme_frame": "m16_colognato-001.jpg"
    },
    "colors": {
      "frame": "#0b2273",
      "tab_background_text": "#eeff00"
    }
  },
  "version": "2.0",
  "name": "BluNebula",
  "manifest_version": 2,
  "description": "Galactic nebulae release all the beauty of colors"
}