Examine source code of Dark-ish Rainbow

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Dark-ish Rainbow",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-017-2de428a06dc9ef685439af2292aab531.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(72, 17, 164)",
      "toolbar_text": "rgb(244, 130, 147)",
      "frame": "rgb(23, 82, 127)",
      "tab_background_text": "rgb(173, 167, 21)",
      "toolbar_field": "rgb(62, 62, 62)",
      "toolbar_field_text": "rgb(248, 99, 125)",
      "tab_line": "rgb(21, 232, 213)",
      "popup": "rgb(39, 45, 74)",
      "popup_text": "rgb(62, 180, 194)",
      "tab_loading": "rgb(21, 232, 213)"
    }
  }
}