Examine source code of Here Be Treasure

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#0d0de3"
    }
  },
  "version": "2.0",
  "name": "Here Be Treasure",
  "manifest_version": 2,
  "description": "'x' marks the spot to find your pirate booty buried on a far flung Carribean isle.\nCreated by Chillidog."
}