Examine source code of David Bowie heroes

{
  "name": "David Bowie",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "bowie.jpg"
    },
    "colors": {
      "frame": "rgba(214, 124, 199, 0.43)",
      "tab_background_text": "rgba(138, 143, 49, 1)",
      "toolbar": "rgba(255, 102, 0, 0.3)",
      "bookmark_text": "rgba(20, 20, 20, 0.69)",
      "toolbar_field": "rgba(204, 212, 49, 0.35)",
      "toolbar_field_text": "rgba(181, 194, 97, 1)"
    }
  }
}