Examine source code of Nightly Violet

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Nightly Violet",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(67, 67, 79)",
      "toolbar_text": "rgb(234, 234, 234)",
      "frame": "rgb(38, 42, 47)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(56, 61, 66)",
      "toolbar_field_text": "rgb(230, 230, 230)",
      "tab_line": "rgb(96, 96, 96)",
      "popup": "rgb(45, 45, 49)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_hover": "rgb(116, 105, 128)",
      "icons": "rgb(139, 139, 193)",
      "popup_border": "rgb(102, 97, 112)",
      "tab_loading": "rgb(96, 96, 96)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{dea86f4f-2d18-4347-96e9-a8415a949eb1}"
    }
  }
}