--- a/browser/base/content/browser.css
+++ b/browser/base/content/browser.css
@@ -240,17 +240,16 @@ window:not([chromehidden~="toolbar"]) #n
 
 
 %ifdef CAN_DRAW_IN_TITLEBAR
 %ifdef MENUBAR_CAN_AUTOHIDE
 #toolbar-menubar:not([autohide=true]) ~ #TabsToolbar > .titlebar-placeholder,
 %endif
 %ifndef MOZ_WIDGET_COCOA
 #main-window:not([sizemode=normal]) .titlebar-placeholder[type="pre-tabs"],
-#main-window:not([sizemode=normal]) .titlebar-placeholder[type="post-tabs"],
 %endif
 #main-window:not([chromemargin]) > #titlebar,
 #main-window[inFullscreen] > #titlebar,
 #main-window[inFullscreen] .titlebar-placeholder,
 #main-window:not([tabsintitlebar]) .titlebar-placeholder {
   display: none;
 }