Examine source code of Superman 1.5

{
  "theme": {
    "images": {
      "theme_frame": "186-supermanupdatedheader2500x200.jpg"
    },
    "colors": {
      "frame": "#153d8c",
      "tab_background_text": "#0d0d0d"
    }
  },
  "version": "2.0",
  "name": "Superman 1.5",
  "manifest_version": 2
}