Examine source code of Ubuntu Brown Yellow

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Ubuntu Brown Yellow",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-019-7ce748211c61f9059493d4c4378e8a74.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(87, 76, 72)",
      "toolbar_text": "rgb(255, 232, 149)",
      "frame": "rgb(50, 45, 41)",
      "tab_background_text": "rgb(233, 233, 233)",
      "toolbar_field": "rgb(67, 59, 57)",
      "toolbar_field_text": "rgb(204, 102, 51)",
      "tab_line": "rgb(255, 200, 10)",
      "popup": "rgb(87, 76, 72)",
      "popup_text": "rgb(255, 232, 149)",
      "tab_loading": "rgb(255, 200, 10)"
    }
  }
}