Examine source code of raven_dark

{
  "name": "raven_dark",
  "manifest_version": 2,
  "version": "5.0",
  "theme": {
    "images": {
      "theme_frame": "krähen kollage 3000 x 100 px_farbig.png"
    },
    "colors": {
      "frame": "rgba(8, 18, 38, 0.95)",
      "tab_background_text": "rgba(174, 175, 181, 1)",
      "toolbar": "rgba(18, 19, 33, 0.8)",
      "bookmark_text": "rgba(138, 166, 212, 0.76)",
      "toolbar_field": "rgba(30, 74, 204, 0.36)",
      "toolbar_field_text": "rgba(190, 186, 196, 0.9)"
    }
  }
}