Examine source code of Regimental Grey

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Regimental Grey",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(181, 186, 192)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(158, 165, 166)",
      "tab_background_text": "rgb(34, 39, 74)",
      "toolbar_field": "rgb(34, 39, 74)",
      "toolbar_field_text": "rgb(177, 180, 184)",
      "tab_line": "rgb(255, 206, 0)",
      "popup": "rgb(181, 186, 192)",
      "popup_text": "rgb(0, 0, 0)",
      "ntp_background": "rgb(181, 186, 192)",
      "tab_background_separator": "rgba(34, 39, 74, 0.66)",
      "tab_loading": "rgb(118, 122, 125)",
      "tab_selected": "rgb(34, 39, 74)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_top_separator": "rgb(158, 165, 166)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6ee128f1-8297-45e6-9cda-7956a5e7d14d}"
    }
  }
}