Examine source code of Future Spheres

{
  "name": "Future Spheres",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Teal - Black Marbles.jpg"
    },
    "colors": {
      "frame": "rgba(64, 72, 89, 1)",
      "tab_background_text": "rgba(60, 140, 123, 1)"
    }
  }
}