Examine source code of Ultimate Blue

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Ultimate Blue",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-005-f5f3cf677b1f132c75ddc7bd319dd1fc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(20, 27, 60)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(7, 9, 35)",
      "tab_background_text": "rgb(215, 226, 239)",
      "toolbar_field": "rgb(44, 48, 83)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(0, 87, 213)",
      "popup": "rgb(0, 20, 48)",
      "popup_text": "rgb(215, 226, 239)",
      "ntp_background": "rgb(0, 20, 65)",
      "tab_selected": "rgb(0, 24, 59)",
      "toolbar_field_border_focus": "rgb(0, 73, 129)",
      "toolbar_field_focus": "rgb(30, 31, 46)",
      "tab_loading": "rgb(0, 87, 213)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3ce3716f-6748-43b0-8f13-fe37912253b5}"
    }
  }
}