Examine source code of Midnight Variant 2

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Midnight2",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(10, 26, 49)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(16, 16, 30)",
      "tab_background_text": "rgb(34, 68, 82)",
      "toolbar_field": "rgb(52, 160, 200)",
      "toolbar_field_text": "rgb(4, 1, 90)",
      "tab_line": "rgb(24, 40, 63)",
      "popup": "rgb(41, 134, 170)",
      "popup_text": "rgb(0, 26, 175)",
      "tab_loading": "rgb(24, 40, 63)"
    }
  }
}