Examine source code of DarkMode V2

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "DarkMode V2",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-026-829b05416f823e170310e7c826ad1bec.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(27, 40, 45)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(245, 245, 255)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(153, 0, 255)",
      "popup": "rgb(31, 32, 32)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(205, 41, 44)",
      "tab_selected": "rgb(44, 43, 46)",
      "tab_text": "rgb(255, 255, 255)"
    }
  }
}