--- a/toolkit/content/widgets/tree.xml
+++ b/toolkit/content/widgets/tree.xml
@@ -625,17 +625,17 @@
 
             this.treeBoxObject.ensureRowIsVisible(edge);
           ]]>
         </body>
       </method>
     </implementation>
     
     <handlers>
-      <handler event="DOMMouseScroll" phase="capturing">
+      <handler event="DOMMouseScroll">
         <![CDATA[
           if (this._editingColumn)
             return;
           if (event.axis == event.HORIZONTAL_AXIS)
             return;
 
           var rows = event.detail;
           if (rows == NSUIEvent.SCROLL_PAGE_UP)