Examine source code of Developer Dark Recreation

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Developer Dark Recreation",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-001-9c6d74e14860e77ee6f8f43e824bff25.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(0, 0, 0)",
      "toolbar_text": "rgb(86, 216, 255)",
      "frame": "rgb(13, 27, 36)",
      "tab_background_text": "rgb(143, 171, 183)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(28, 28, 49)",
      "tab_line": "rgb(86, 216, 255)",
      "popup": "rgb(59, 59, 86)",
      "popup_text": "rgb(86, 216, 255)",
      "button_background_active": "rgb(111, 169, 188)",
      "button_background_hover": "rgb(141, 187, 202)",
      "icons_attention": "rgb(218, 218, 218)",
      "icons": "rgb(86, 216, 255)",
      "ntp_text": "rgb(199, 211, 215)",
      "tab_background_separator": "rgb(233, 233, 233)",
      "tab_loading": "rgb(255, 255, 255)",
      "tab_selected": "rgb(77, 139, 161)",
      "tab_text": "rgb(255, 255, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0f8f822a-b124-4c46-8960-18789bc1b7f4}"
    }
  }
}