Examine source code of Barcelona inspired theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Barcelona theme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-011-d53e0d0d1538ed554a90e056a2f04eca.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(116, 21, 21)",
      "toolbar_text": "rgb(185, 32, 32)",
      "frame": "rgb(13, 66, 97)",
      "tab_background_text": "rgb(244, 233, 33)",
      "toolbar_field": "rgb(252, 252, 252)",
      "toolbar_field_text": "rgb(255, 0, 4)",
      "tab_line": "rgb(255, 0, 4)",
      "popup": "rgb(116, 21, 21)",
      "popup_text": "rgb(177, 63, 87)",
      "tab_loading": "rgb(255, 0, 4)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2e8959fc-b9df-48c6-bcc7-096052729bd8}"
    }
  }
}