Examine source code of BridgeBaseOnline

{
  "theme": {
    "images": {
      "theme_frame": "BBOhead.jpg"
    },
    "colors": {
      "frame": "#fc0303",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "BridgeBaseOnline",
  "manifest_version": 2,
  "description": "BridgeBase Online features partnership and team bridge games at every level of expertise from beginner to top expert, players from all over the world, live vugraph presentations of top championships, and much more.\n\nP.S.  It's mostly free!"
}