diff --git a/browser/themes/windows/browser.css b/browser/themes/windows/browser.css
index cc96a9f6668a..629d2f7d1669 100644
--- a/browser/themes/windows/browser.css
+++ b/browser/themes/windows/browser.css
@@ -39,8 +39,8 @@
   margin-top: 3px;
 }
 
-#main-window[tabsintitlebar][sizemode="normal"][chromehidden~="menubar"] #toolbar-menubar ~ #TabsToolbar,
-#main-window[tabsintitlebar][sizemode="normal"] #toolbar-menubar[autohide="true"][inactive] ~ #TabsToolbar {
+#main-window[tabsintitlebar][sizemode="normal"]:not([inFullscreen])[chromehidden~="menubar"] #toolbar-menubar ~ #TabsToolbar,
+#main-window[tabsintitlebar][sizemode="normal"]:not([inFullscreen]) #toolbar-menubar[autohide="true"][inactive] ~ #TabsToolbar {
   margin-top: 15px;
 }