Examine source code of Blue Circuit Dark

{
  "manifest_version": 2,
  "version": "2.1",
  "name": "Blue Circuit Dark",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(15, 17, 30, 0.6)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(10, 10, 10)",
      "tab_background_text": "rgb(215, 226, 239)",
      "toolbar_field": "rgb(54, 58, 70)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(47, 112, 162)",
      "popup": "rgba(27, 40, 45, 0.9)",
      "popup_text": "rgb(215, 226, 239)",
      "ntp_background": "rgb(28, 27, 34)",
      "ntp_text": "rgb(150, 159, 150)",
      "tab_loading": "rgb(47, 112, 162)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3196ec9e-6c5d-4fbf-95a7-a861c133b25c}"
    }
  }
}