Examine source code of Hunt01

{
  "name": "15",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "15.jpg"
    },
    "colors": {
      "frame": "rgba(68, 107, 97, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(128, 118, 118, 0.25)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(0, 0, 0, 0)"
    }
  }
}