Examine source code of Wolfenstein BJ

{
  "name": "Wolfenstein BJ",
  "manifest_version": 2,
  "version": "3.5",
  "theme": {
    "images": {
      "theme_frame": "bj_wolf.jpg"
    },
    "colors": {
      "frame": "rgba(125, 0, 13, 1)",
      "tab_background_text": "rgba(237, 218, 218, 1)",
      "toolbar": "rgba(33, 32, 32, 0.18)",
      "bookmark_text": "rgba(237, 218, 218, 1)",
      "toolbar_field": "rgba(255, 255, 255, 0.8)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)"
    }
  }
}