Examine source code of Dark Decay

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Dark Decay",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-008-60d2718f8c915b5ba09f31df5555b459.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(16, 20, 25)",
      "toolbar_text": "rgb(182, 190, 202)",
      "frame": "rgb(14, 18, 23)",
      "tab_background_text": "rgb(182, 190, 202)",
      "toolbar_field": "rgb(21, 25, 30)",
      "toolbar_field_text": "rgb(182, 190, 202)",
      "tab_line": "rgb(146, 213, 155)",
      "popup": "rgb(26, 30, 35)",
      "popup_text": "rgb(182, 190, 202)",
      "tab_loading": "rgb(146, 213, 155)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e4918942-b1f8-4893-b4ee-d50e7d8ec9f8}"
    }
  }
}