diff --git a/xpfe/components/sidebar/resources/customize.xul b/xpfe/components/sidebar/resources/customize.xul
index e0e7e6492bda..c3dc2871b8b3 100644
--- a/xpfe/components/sidebar/resources/customize.xul
+++ b/xpfe/components/sidebar/resources/customize.xul
@@ -57,7 +57,7 @@
         datasources="rdf:null"
         indent="true"
         multiple="true"
-        style="height:15em">
+        style="height:20em">
   
         <template>
           <treechildren>