Examine source code of Crimson Glass

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Tinted Red Glass",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-013-06591d4ad28ab7b9ee90f62f81d6b505.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(104, 59, 59, 0.5)",
      "toolbar_text": "rgba(255, 255, 255, 0.75)",
      "frame": "rgb(55, 31, 31)",
      "tab_background_text": "rgb(148, 157, 173)",
      "toolbar_field": "rgba(135, 90, 90, 0.25)",
      "toolbar_field_text": "rgba(255, 255, 255, 0.75)",
      "tab_line": "rgba(210, 136, 136, 0)",
      "popup": "rgba(62, 41, 39, 0.75)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgba(210, 136, 136, 0)"
    }
  }
}