Examine source code of minimalisticblack

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "boop",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(33, 33, 38)",
      "toolbar_text": "rgba(250, 248, 255, 0.91)",
      "frame": "rgb(9, 8, 10)",
      "tab_background_text": "rgb(255, 252, 255)",
      "toolbar_field": "rgb(14, 14, 17)",
      "toolbar_field_text": "rgb(253, 251, 255)",
      "tab_line": "rgb(34, 30, 42)",
      "popup": "rgb(52, 52, 59)",
      "popup_text": "rgb(219, 224, 231)",
      "toolbar_field_border": "rgb(23, 23, 28)",
      "tab_loading": "rgb(34, 30, 42)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{be9f4bb4-0fa8-4c72-a1af-ebe630ea5df0}"
    }
  }
}