Examine source code of Dark Gray (Red)

{
  "manifest_version": 2,
  "version": "1.3",
  "name": "Dark Gray (Red)",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(51, 51, 51)",
      "toolbar_text": "rgb(248, 248, 242)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(170, 170, 170)",
      "toolbar_field": "rgb(32, 32, 32)",
      "toolbar_field_text": "rgb(248, 248, 242)",
      "tab_line": "rgb(184, 20, 20)",
      "popup": "rgb(32, 32, 32)",
      "popup_text": "rgb(248, 248, 242)",
      "button_background_hover": "rgb(77, 77, 77)",
      "icons": "rgb(248, 248, 242)",
      "ntp_background": "rgb(32, 32, 32)",
      "ntp_text": "rgb(248, 248, 242)",
      "popup_border": "rgb(59, 59, 59)",
      "popup_highlight": "rgb(59, 59, 59)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_bottom_separator": "rgb(59, 59, 59)",
      "toolbar_field_border_focus": "rgb(64, 64, 64)",
      "toolbar_field_border": "rgb(51, 51, 51)",
      "toolbar_field_focus": "rgb(32, 32, 32)",
      "toolbar_field_highlight": "rgb(184, 20, 20)",
      "toolbar_field_text_focus": "rgb(248, 248, 242)",
      "toolbar_top_separator": "rgb(0, 0, 0)",
      "tab_loading": "rgb(184, 20, 20)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{56e606ec-be3c-4e75-bf88-f9d2c0aec7dd}"
    }
  }
}