Examine source code of Dark Cube

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Dark Cube",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0.35)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(19, 20, 20)",
      "tab_background_text": "rgb(196, 198, 199)",
      "toolbar_field": "rgba(76, 78, 78, 0.1)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(251, 251, 251)",
      "popup": "rgb(19, 20, 20)",
      "popup_text": "rgb(216, 216, 216)",
      "tab_loading": "rgb(251, 251, 251)"
    }
  }
}