Examine source code of viejostilo

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "viejostilo",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(14, 41, 86, 0.49)",
      "toolbar_text": "rgb(191, 150, 93)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(191, 150, 93)",
      "toolbar_field": "rgba(50, 50, 50, 0.9)",
      "toolbar_field_text": "rgb(191, 150, 93)",
      "tab_line": "rgb(191, 150, 93)",
      "popup": "rgb(31, 44, 64)",
      "popup_text": "rgb(191, 150, 93)",
      "button_background_hover": "rgba(233, 35, 35, 0.34)",
      "popup_border": "rgb(191, 150, 93)",
      "tab_selected": "rgba(97, 2, 2, 0.58)",
      "toolbar_bottom_separator": "rgb(191, 150, 93)",
      "toolbar_field_border": "rgb(0, 0, 0)",
      "toolbar_top_separator": "rgb(191, 150, 93)",
      "tab_loading": "rgb(191, 150, 93)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{495bf238-24d7-42cd-9b01-433bf43e8c69}"
    }
  }
}