Examine source code of Dark and sweet

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Very sweet",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(4, 3, 21, 0)",
      "toolbar_text": "rgb(255, 190, 179)",
      "frame": "rgb(4, 3, 21)",
      "tab_background_text": "rgb(176, 176, 183)",
      "toolbar_field": "rgba(0, 0, 0, 0)",
      "toolbar_field_text": "rgb(255, 190, 179)",
      "tab_line": "rgb(255, 201, 179)",
      "popup": "rgba(6, 9, 22, 0.77)",
      "popup_text": "rgb(255, 238, 233)",
      "tab_loading": "rgb(255, 201, 179)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cbe78981-44ad-4dfe-b64b-f760260069df}"
    }
  }
}