Examine source code of Black-Orange Squared

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Black-Orange Squared",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-005-f5f3cf677b1f132c75ddc7bd319dd1fc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(31, 31, 31)",
      "toolbar_text": "rgb(255, 163, 0)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(149, 149, 149)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(139, 189, 253)",
      "tab_line": "rgb(255, 163, 0)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(255, 163, 0)",
      "ntp_background": "rgb(0, 0, 0)",
      "sidebar_highlight_text": "rgb(139, 189, 253)",
      "sidebar_highlight": "rgb(81, 44, 0)",
      "sidebar_text": "rgb(255, 163, 0)",
      "sidebar": "rgb(0, 0, 0)",
      "tab_background_separator": "rgb(255, 163, 0)",
      "toolbar_field_separator": "rgb(255, 163, 0)",
      "toolbar_vertical_separator": "rgb(115, 115, 115)",
      "tab_loading": "rgb(255, 163, 0)"
    }
  }
}