Examine source code of VGUI

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "VGUI",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(90, 106, 80)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(90, 106, 80)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(76, 88, 68)",
      "toolbar_field_text": "rgb(223, 189, 58)",
      "tab_line": "rgb(76, 88, 68)",
      "popup": "rgb(90, 106, 80)",
      "popup_text": "rgb(0, 0, 0)",
      "button_background_active": "rgb(131, 130, 131)",
      "icons": "rgb(255, 255, 255)",
      "ntp_background": "rgb(192, 192, 192)",
      "tab_text": "rgb(223, 189, 58)",
      "toolbar_field_border": "rgb(131, 130, 131)",
      "tab_loading": "rgb(76, 88, 68)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{abcf59c8-446b-4a4c-a074-9d23759a76af}"
    }
  }
}