Examine source code of Dark Shell

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Dark Shell",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-002-609370e89a219e0548ac5ef6b4a7dd2e.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(19, 19, 19)",
      "toolbar_text": "rgb(82, 31, 204)",
      "frame": "rgb(38, 38, 38)",
      "tab_background_text": "rgb(255, 162, 0)",
      "toolbar_field": "rgb(41, 41, 41)",
      "toolbar_field_text": "rgb(255, 162, 0)",
      "tab_line": "rgb(82, 31, 204)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(98, 102, 183)",
      "button_background_active": "rgb(36, 36, 36)",
      "button_background_hover": "rgb(67, 43, 0)",
      "frame_inactive": "rgb(117, 117, 117)",
      "icons_attention": "rgb(255, 0, 0)",
      "icons": "rgb(255, 162, 0)",
      "ntp_background": "rgb(52, 52, 52)",
      "ntp_text": "rgb(117, 117, 117)",
      "popup_border": "rgb(0, 0, 0)",
      "popup_highlight_text": "rgb(255, 162, 0)",
      "popup_highlight": "rgb(47, 47, 47)",
      "sidebar_border": "rgb(0, 0, 0)",
      "sidebar_highlight": "rgb(255, 162, 0)",
      "sidebar": "rgb(1, 38, 9)",
      "tab_background_separator": "rgb(0, 0, 0)",
      "tab_selected": "rgb(19, 19, 19)",
      "tab_text": "rgb(255, 162, 0)",
      "toolbar_field_text_focus": "rgb(82, 31, 204)",
      "toolbar_vertical_separator": "rgb(19, 19, 19)",
      "tab_loading": "rgb(82, 31, 204)"
    }
  }
}