Examine source code of Safari Black

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Black Abyss",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(34, 34, 34)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(113, 113, 113)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgba(248, 112, 140, 0)",
      "popup": "rgba(111, 111, 111, 0.8)",
      "popup_text": "rgb(243, 243, 243)",
      "tab_loading": "rgba(248, 112, 140, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6e85a8d4-5129-4da9-9320-cb85160f38c4}"
    }
  }
}