Examine source code of Clutch dark

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Clutch dark",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(3, 3, 3, 0.34)",
      "toolbar_text": "rgb(51, 113, 211)",
      "frame": "rgb(5, 6, 15)",
      "tab_background_text": "rgb(51, 86, 120)",
      "toolbar_field": "rgb(54, 66, 117)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(188, 53, 166)",
      "popup": "rgb(15, 21, 77)",
      "popup_text": "rgb(126, 142, 166)",
      "tab_loading": "rgb(188, 53, 166)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{24269023-8a6d-4eda-a97e-a6b4e51d9a30}"
    }
  }
}