Examine source code of Darkish Grey

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Darkish",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-011-d53e0d0d1538ed554a90e056a2f04eca.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(146, 149, 150)",
      "toolbar_text": "rgb(240, 243, 244)",
      "frame": "rgb(69, 69, 70)",
      "tab_background_text": "rgb(195, 196, 201)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(81, 81, 82)",
      "tab_line": "rgb(228, 73, 13)",
      "popup": "rgb(97, 100, 103)",
      "popup_text": "rgb(224, 224, 228)",
      "tab_loading": "rgb(228, 73, 13)"
    }
  }
}