月光都说了，Google的大多数页面还是白色顶栏比较合适，黑的看着实在是不爽。所以还是改回来好了：

// ==UserScript==
// @name          White Google topbar
// @namespace     http://lilydjwg.is-programmer.com/
// @description	  bring back google's white topbar
// @include       http://*.google.com*
// @include       https://*.google.com*
// ==/UserScript==

var css = "#gbx3, #gbx4 { background-color: #ffffff; border-bottom: 1px solid #3366cc; } #gbz .gbzt, #gbz .gbgt, #gbg .gbgt, .gbts, .gbz0l { color: #3366cc !important; } .gbzt-hvr, .gbzt:focus, .gbgt-hvr, .gbgt:focus { background-color: #eff3fb; } .gbz0l .gbtb2 { border-top-color: #3d7af5 !important; } #gbi5 { background-position: -6px -22px; }";
if (typeof GM_addStyle != "undefined") {
  GM_addStyle(css);
} else if (typeof PRO_addStyle != "undefined") {
  PRO_addStyle(css);
} else if (typeof addStyle != "undefined") {
  addStyle(css);
} else {
  var heads = document.getElementsByTagName("head");
  if (heads.length > 0) {
    var node = document.createElement("style");
    node.type = "text/css";
    node.appendChild(document.createTextNode(css));
    heads[0].appendChild(node); 
  }
}

点击安装。