Examine source code of Dark and red

{
  "name": "Dark and red",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "Sin título-1.png"
    },
    "colors": {
      "toolbar": "rgba(33, 33, 33, 1)",
      "toolbar_field": "rgba(61, 61, 61, 1)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "frame": "rgba(20, 20, 20, 1)",
      "tab_background_text": "rgba(255, 0, 0, 0.85)",
      "bookmark_text": "rgba(255, 0, 0, 1)"
    }
  }
}