Examine source code of Delta Black

{
  "theme": {
    "images": {
      "theme_frame": "persona1.png"
    },
    "colors": {
      "frame": "#282f3d",
      "tab_background_text": "#3d5687"
    }
  },
  "version": "2.0",
  "name": "Delta Black",
  "manifest_version": 2,
  "description": "Black tiled"
}