--- a/toolkit/content/widgets/menulist.xml
+++ b/toolkit/content/widgets/menulist.xml
@@ -407,17 +407,17 @@
       </destructor>
     </implementation>
   </binding>
 
   <binding id="menulist-editable" extends="chrome://global/content/bindings/menulist.xml#menulist">
     <content sizetopopup="pref">
       <xul:hbox class="menulist-editable-box textbox-input-box" xbl:inherits="context,disabled,readonly,focused" flex="1">
         <html:input class="menulist-editable-input" flex="1" anonid="input" allowevents="true"
-                    xbl:inherits="value=label,value,disabled,tabindex,readonly"/>
+                    xbl:inherits="value=label,value,disabled,tabindex,readonly,placeholder"/>
       </xul:hbox>
       <xul:dropmarker class="menulist-dropmarker" type="menu"
                       xbl:inherits="open,disabled,parentfocused=focused"/>
       <children includes="menupopup"/>
     </content>
 
     <implementation>
       <method name="_selectInputFieldValueInList">