Examine source code of Gotham

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Gotham",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(0, 0, 0)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(8, 8, 8)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(19, 20, 21)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(59, 59, 59)",
      "popup": "rgb(30, 30, 30)",
      "popup_text": "rgb(255, 255, 255)",
      "ntp_background": "rgb(0, 0, 0)",
      "tab_loading": "rgb(18, 181, 241)",
      "tab_selected": "rgb(34, 34, 34)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2395a059-18cf-4173-b11d-f92a087a17a5}"
    }
  }
}