Backed out changeset 58fd8a926bf5 (bug 366203) due to it causing bug 524293.

layout/xul/base/src/crashtests/366203-1.xul

@@ -1,40 +0,0 @@
-<?xml version="1.0"?>
-
-<?xml-stylesheet href="chrome://global/skin/" type="text/css"?>
-
-<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" onload="setTimeout(boom, 500);">
-
-<script>
-function boom()
-{
-  tc1 = document.getElementById("tc1");
-  tc1.parentNode.removeChild(tc1);
-}
-</script>
-
-<tree rows="6">
-  <treecols>
-      <treecol id="firstname" label="First Name" primary="true" flex="3"/>
-      <treecol id="lastname" label="Last Name" flex="7"/>
-  </treecols>
-
-  <treechildren id="tc1">
-    <treeitem container="true" open="true">
-      <treerow>
-        <treecell label="Foo"/>
-      </treerow>
-    </treeitem>
-  </treechildren>
-
-  <treechildren>
-    <treeitem container="true" open="true">
-      <treerow>
-        <treecell label="Bar"/>
-      </treerow>
-    </treeitem>
-  </treechildren>
-</tree>
-
-
-</window>
-

layout/xul/base/src/crashtests/crashtests.list

@@ -24,7 +24,6 @@ load 346083-1.xul
 load 346281-1.xul
 load 360642-1.xul
 load 366112-1.xul
-load 366203-1.xul
 load 369942-1.xhtml
 load 374102-1.xul
 load 376137-1.html

toolkit/content/xul.css

@@ -551,7 +551,7 @@ treecol.treecol-image {
   -moz-binding: url("chrome://global/content/bindings/tree.xml#treecol-image");
 }
 
-tree > treechildren:first-of-type {
+tree > treechildren {
   display: -moz-box;
   -moz-binding: url("chrome://global/content/bindings/tree.xml#treebody");
   -moz-user-select: none;