Examine source code of Darkish Theme V2.0

{
  "manifest_version": 2,
  "version": "2.0",
  "name": "Darkish Theme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png",
        "images/1.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top",
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat",
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(95, 95, 95)",
      "toolbar_field": "rgb(50, 50, 50)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(255, 0, 0)",
      "popup": "rgb(95, 95, 95)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(255, 0, 0)",
      "bookmark_text": "rgb(255, 255, 255)",
      "frame": "rgb(68, 68, 68)",
      "tab_background_text": "rgb(216, 224, 233)"
    }
  }
}