Examine source code of Ryuko Dark

{
  "manifest_version": 2,
  "version": "2.0",
  "name": "Ryuko Dark",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(10, 10, 10, 0)",
      "toolbar_field": "rgb(35, 35, 35)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(152, 0, 31)",
      "popup": "rgb(35, 35, 35)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(152, 0, 31)",
      "bookmark_text": "rgb(190, 11, 48)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(150, 150, 150)"
    }
  }
}