SigShade.user.js

// ==UserScript==
// @name          SigShade
// @namespace     http://userstyles.org
// @description	  Truncates <pre> blocks in Gmail. 
// @author        chaplang
// @homepage      http://userstyles.org/styles/93531
// @include       https://mail.google.com*
// @run-at        document-start
// ==/UserScript==
(function() {
//var css = ".gs pre {width: 250px;\nwhite-space: nowrap !important;\noverflow: hidden;\ntext-overflow: ellipsis}";
var css = ".gs pre { width: 250px; white-space: nowrap !important; overflow: hidden; text-overflow: ellipsis; height: 20px; border: 1px solid #CCC; border-left: 0; border-right: 0; padding: 10px 0; opacity: 0.3; } .gs pre:hover { opacity: 0.7; cursor: pointer; } .gs pre:active { opacity: 1; overflow: visible; height: auto; width: auto; white-space: pre-wrap !important; text-overflow: initial; }";
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 node = document.createElement("style");
	node.type = "text/css";
	node.appendChild(document.createTextNode(css));
	var heads = document.getElementsByTagName("head");
	if (heads.length > 0) {
		heads[0].appendChild(node); 
	} else {
		// no head yet, stick it whereever
		document.documentElement.appendChild(node);
	}
}
})();