Examine source code of Space Observatory

{
  "theme": {
    "images": {
      "theme_frame": "ff_persona_space_observatory_header.jpg"
    },
    "colors": {
      "frame": "#666666",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Space Observatory",
  "manifest_version": 2,
  "description": "Light gray abstract theme that is easy on the eyes and won't take up too much of your attention. With cool space / planet graphics to spice things up."
}