diff --git a/mozilla/xpfe/global/resources/content/bindings/outliner.xml b/mozilla/xpfe/global/resources/content/bindings/outliner.xml
index 2ba29490bf7..d8244c7a93a 100644
--- a/mozilla/xpfe/global/resources/content/bindings/outliner.xml
+++ b/mozilla/xpfe/global/resources/content/bindings/outliner.xml
@@ -961,7 +961,7 @@
              if (colNode) {
                var checkedState = aPopup.getAttribute("checked");
                if (checkedState == "true")
-                 colNode.removeAttribute("hidden");
+                 colNode.setAttribute("hidden", "false");
                else
                  colNode.setAttribute("hidden", "true");
              }