Examine source code of Kuroki

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Kuroki",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(46, 52, 54)",
      "toolbar_text": "rgb(238, 238, 236)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(186, 189, 182)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(238, 238, 236)",
      "tab_line": "rgb(238, 238, 236)",
      "popup": "rgb(46, 52, 54)",
      "popup_text": "rgb(238, 238, 236)",
      "tab_loading": "rgb(238, 238, 236)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{839832c6-b9a7-4aa5-9585-d7299b3d22d0}"
    }
  }
}