Examine source code of Square Dark

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Square Dark",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-020-48c286b34e53380d46803c2e5603a5b2.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(24, 24, 24)",
      "toolbar_text": "rgb(187, 88, 108)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(128, 13, 122)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(185, 169, 0)",
      "tab_line": "rgb(244, 112, 248)",
      "popup": "rgb(42, 39, 2)",
      "popup_text": "rgb(53, 234, 72)",
      "tab_loading": "rgb(244, 112, 248)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a871f2f8-085a-4655-b353-e0fc21c293af}"
    }
  }
}