Examine source code of Death City

{
  "theme": {
    "images": {
      "theme_frame": "death.jpg"
    },
    "colors": {
      "frame": "#ae00ff",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Death City",
  "manifest_version": 2,
  "description": "Credit for wallpaper to wallnosekai.blogspot.com"
}