Examine source code of Black Red crow

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Black Red crow",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-006-51ab495c5f5dde6a3cddb22484acd00d.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(51, 50, 50, 0.86)",
      "toolbar_text": "rgb(187, 8, 8)",
      "frame": "rgb(32, 31, 31)",
      "tab_background_text": "rgb(211, 206, 206)",
      "toolbar_field": "rgb(48, 21, 21)",
      "toolbar_field_text": "rgb(194, 194, 194)",
      "tab_line": "rgb(237, 2, 2)",
      "popup": "rgb(74, 74, 79)",
      "popup_text": "rgb(253, 253, 253)",
      "tab_loading": "rgb(237, 2, 2)"
    }
  }
}