Examine source code of Atomic Retro

{
  "theme": {
    "images": {
      "theme_frame": "cosmic-header.jpg"
    },
    "colors": {
      "frame": "#7d7d7d",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Atomic Retro",
  "manifest_version": 2,
  "description": "A funky atomic age design with retro flair"
}