diff --git a/browser/themes/shared/customizableui/panelUIOverlay.inc.css b/browser/themes/shared/customizableui/panelUIOverlay.inc.css
index d62ddf8d7b08..b7af549efb0b 100644
--- a/browser/themes/shared/customizableui/panelUIOverlay.inc.css
+++ b/browser/themes/shared/customizableui/panelUIOverlay.inc.css
@@ -394,10 +394,15 @@ toolbarbutton.panel-multiview-anchor {
   -moz-box-flex: 1;
 }
 
-#search-container@inAnyPanel@ {
+#search-container[cui-areatype="menu-panel"] {
   width: @menuPanelWidth@;
 }
 
+toolbarpaletteitem[place="palette"] > #search-container {
+  min-width: 7em;
+  width: 7em;
+}
+
 #edit-controls@inAnyPanel@ > toolbarbutton,
 #zoom-controls@inAnyPanel@ > toolbarbutton {
   -moz-appearance: none;