--- a/browser/base/content/browser.xul
+++ b/browser/base/content/browser.xul
@@ -615,17 +615,16 @@
 # The entire main menubar is placed into browser-menubar.inc, so that it can be shared by
 # hiddenWindow.xul.
 #include browser-menubar.inc
       </toolbaritem>
 
 #ifdef CAN_DRAW_IN_TITLEBAR
 #ifndef XP_MACOSX
       <hbox class="titlebar-placeholder" type="caption-buttons" ordinal="1000"
-            persist="width"
             skipintoolbarset="true"/>
 #endif
 #endif
     </toolbar>
 
     <toolbar id="TabsToolbar"
              fullscreentoolbar="true"
              customizable="true"
@@ -689,25 +688,23 @@
 
       <button class="accessibility-indicator" tooltiptext="&accessibilityIndicator.tooltip;"
               ordinal="1000"
               aria-live="polite" skipintoolbarset="true"/>
       <hbox class="private-browsing-indicator" skipintoolbarset="true"
             ordinal="1000"/>
 #ifdef CAN_DRAW_IN_TITLEBAR
       <hbox class="titlebar-placeholder" type="caption-buttons"
-            persist="width"
 #ifndef XP_MACOSX
             ordinal="1000"
 #endif
             skipintoolbarset="true"/>
 
 #ifdef XP_MACOSX
       <hbox class="titlebar-placeholder" type="fullscreen-button"
-            persist="width"
             skipintoolbarset="true"/>
 #endif
 #endif
     </toolbar>
 
     <toolbar id="nav-bar"
              aria-label="&navbarCmd.label;"
              fullscreentoolbar="true" mode="icons" customizable="true"