Examine source code of A Light Journey

{
  "name": "A Light Journey",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "journey2.png"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(184, 119, 66, 0.76)",
      "toolbar": "rgba(214, 130, 21, 0.23)",
      "bookmark_text": "rgba(138, 61, 17, 0.8)",
      "toolbar_field": "rgba(255, 248, 219, 0.59)",
      "toolbar_field_text": "rgba(133, 75, 45, 0.59)"
    }
  }
}