Backout D��o's patch from bug 388030 due to Mac-only perf regression.

browser/themes/gnomestripe/browser/browser.css

@@ -878,10 +878,15 @@ toolbar[iconsize="small"] #paste-button:not([disabled="true"]):hover:active {
 .formatted-url * {
   margin: 0;
   padding: 0;
+  cursor: text;
+}
+
+.formatted-url-ellipsis {
+  -moz-margin-start: 1px;
 }
 
 .formatted-url-prePath {
-  overflow-x: hidden;
+  -moz-box-pack: center;
 }
 
 #urlbar-container {