--- a/browser/base/content/browser.xul
+++ b/browser/base/content/browser.xul
@@ -135,17 +135,22 @@
 
     <!-- for search and content formfill/pw manager -->
     <panel type="autocomplete" id="PopupAutoComplete" noautofocus="true" hidden="true"/>
 
     <!-- for search with one-off buttons -->
     <panel type="autocomplete" id="PopupSearchAutoComplete" noautofocus="true" hidden="true"/>
 
     <!-- for url bar autocomplete -->
-    <panel type="autocomplete-richlistbox" id="PopupAutoCompleteRichResult" noautofocus="true" hidden="true" flip="none">
+    <panel type="autocomplete-richlistbox"
+           id="PopupAutoCompleteRichResult"
+           noautofocus="true"
+           hidden="true"
+           flip="none"
+           level="parent">
 #ifdef NIGHTLY_BUILD
       <hbox id="urlbar-search-footer" flex="1" align="stretch" pack="end">
         <button id="urlbar-search-settings" label="&changeSearchSettings.button;"
                 oncommand="BrowserUITelemetry.countSearchSettingsEvent('urlbar'); openPreferences('paneSearch')"/>
       </hbox>
 #endif
     </panel>