Examine source code of Maritime Blues

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Maritime Blues",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(15, 39, 60)",
      "toolbar_text": "rgb(219, 219, 219)",
      "frame": "rgb(1, 14, 23)",
      "tab_background_text": "rgb(219, 219, 219)",
      "toolbar_field": "rgb(8, 83, 112)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(241, 207, 66)",
      "popup": "rgb(18, 41, 60)",
      "popup_text": "rgb(207, 207, 207)",
      "tab_loading": "rgb(241, 207, 66)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{67388647-2ce9-4533-aa3c-f5aa6d481125}"
    }
  }
}