Examine source code of Blue & Black Dark Theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Blue Dark Theme by River T.",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-005-f5f3cf677b1f132c75ddc7bd319dd1fc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(0, 0, 0)",
      "toolbar_text": "rgb(253, 253, 253)",
      "frame": "rgb(14, 41, 65)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(38, 72, 102)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(67, 194, 218)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(67, 194, 218)",
      "tab_loading": "rgb(67, 194, 218)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{42def12d-84e1-44e1-81f7-c9e740bdad5b}"
    }
  }
}