Examine source code of Dark Polygon

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Dark Geometry",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-036-40a272fe657f748396e017c7a64ee2dc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(0, 0, 0)",
      "toolbar_text": "rgba(155, 150, 150, 0.75)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(137, 142, 142)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(111, 116, 116)",
      "tab_line": "rgba(119, 0, 8, 0.82)",
      "popup": "rgba(119, 0, 8, 0.88)",
      "popup_text": "rgb(14, 14, 14)",
      "tab_loading": "rgba(119, 0, 8, 0.82)"
    }
  }
}