--- a/browser/components/preferences/in-content/main.xul
+++ b/browser/components/preferences/in-content/main.xul
@@ -510,17 +510,17 @@
               <menuitem value="48" label="48"/>
               <menuitem value="56" label="56"/>
               <menuitem value="64" label="64"/>
               <menuitem value="72" label="72"/>
             </menupopup>
           </menulist>
         </hbox>
       </hbox>
-      <spacer flex="1" />
+
       <!-- Please don't remove the wrapping hbox/vbox/box for these elements. It's used to properly compute the search tooltip position. -->
       <hbox>
         <button id="advancedFonts"
                 class="accessory-button"
                 icon="select-font"
                 label="&advancedFonts.label;"
                 accesskey="&advancedFonts.accesskey;"
                 searchkeywords="&fontsDialog.title;