Examine source code of Red Dark Ghost

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Red Dark Ghost",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-020-48c286b34e53380d46803c2e5603a5b2.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(7, 50, 84)",
      "toolbar_text": "rgb(218, 67, 70)",
      "frame": "rgb(14, 41, 65)",
      "tab_background_text": "rgb(218, 67, 70)",
      "toolbar_field": "rgb(38, 72, 102)",
      "toolbar_field_text": "rgb(218, 67, 70)",
      "tab_line": "rgb(218, 67, 70)",
      "popup": "rgb(7, 50, 84)",
      "popup_text": "rgb(218, 67, 70)",
      "tab_loading": "rgb(218, 67, 70)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0761d937-0472-4761-bc25-a6a7d0f92b53}"
    }
  }
}