diff --git a/src/mozglue/misc/PreXULSkeletonUI-cpp.patch b/src/mozglue/misc/PreXULSkeletonUI-cpp.patch
new file mode 100644
index 000000000..7128248cc
--- /dev/null
+++ b/src/mozglue/misc/PreXULSkeletonUI-cpp.patch
@@ -0,0 +1,13 @@
+diff --git a/mozglue/misc/PreXULSkeletonUI.cpp b/mozglue/misc/PreXULSkeletonUI.cpp
+index 416dce0f1f09b2f567ddf4fdab2beab54491a394..f2ffaf839fab724117500a61ce52618c99987277 100644
+--- a/mozglue/misc/PreXULSkeletonUI.cpp
++++ b/mozglue/misc/PreXULSkeletonUI.cpp
+@@ -862,7 +862,7 @@ Result<Ok, PreXULSkeletonUIError> DrawSkeletonUI(
+   ColorRect toolbar = {};
+   // In the vertical tabs case the main toolbar is in the titlebar:
+   toolbar.color =
+-      verticalTabs ? currentTheme.titlebarColor : currentTheme.backgroundColor;
++      true ? currentTheme.titlebarColor : currentTheme.backgroundColor;
+   toolbar.x = 0;
+   toolbar.y = tabBar.y + tabBarHeight;
+   toolbar.width = sWindowWidth;