Examine source code of s4 league

{
  "theme": {
    "images": {
      "theme_frame": "new.JPG"
    },
    "colors": {
      "frame": "#7a6a6a",
      "tab_background_text": "#b0a0a0"
    }
  },
  "version": "2.0",
  "name": "s4 league",
  "manifest_version": 2,
  "description": "Show me your S4 league!"
}