Examine source code of Minimal Dark Grey

{
  "manifest_version": 2,
  "version": "1.2",
  "name": "Minimal Dark Grey",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(31, 32, 31)",
      "toolbar_text": "rgb(164, 161, 161)",
      "frame": "rgb(31, 32, 31)",
      "tab_background_text": "rgb(134, 131, 131)",
      "toolbar_field": "rgb(31, 32, 31)",
      "toolbar_field_text": "rgb(164, 161, 161)",
      "tab_line": "rgb(185, 182, 182)",
      "popup": "rgb(31, 32, 31)",
      "popup_text": "rgb(210, 214, 212)",
      "tab_background_separator": "rgb(249, 245, 245)",
      "tab_selected": "rgb(66, 67, 66)",
      "tab_text": "rgb(221, 217, 217)",
      "toolbar_bottom_separator": "rgb(35, 36, 35)",
      "toolbar_top_separator": "rgb(31, 32, 31)",
      "tab_loading": "rgb(185, 182, 182)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{804506ab-5125-4b59-bb52-b089df27f3a6}"
    }
  }
}