Examine source code of DarknessTheme

{
  "name": "DarknessTheme",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "aoi-ogata-artwork-aoi-ogata-pinterest-artwork-anime-and-girls (3).jpg"
    },
    "colors": {
      "frame": "rgba(227, 229, 232, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(0, 0, 0, 0.29)",
      "bookmark_text": "rgba(188, 143, 255, 1)",
      "toolbar_field": "rgba(255, 255, 255, 0.33)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)"
    }
  }
}