diff --git a/firefox.spec b/firefox.spec
index 17333bd..930101d 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -225,6 +225,7 @@ Patch422:        mozilla-1631061.patch
 Patch423:        mozilla-1681107.patch
 Patch424:        firefox-wayland-fix-mzbz-1642949-regression.patch
 Patch426:        mozilla-1687931.patch
+Patch427:        mozilla-1678247.patch
 
 # PGO/LTO patches
 Patch600:        pgo.patch
@@ -434,6 +435,7 @@ This package contains results of tests executed during build.
 %patch423 -p1 -b .1681107
 %patch424 -p1 -b .fix-mzbz-1642949-regression
 %patch426 -p1 -b .1687931
+%patch427 -p1 -b .1678247
 
 # PGO patches
 %if %{build_with_pgo}
@@ -736,7 +738,7 @@ tar xf %{SOURCE37}
 cp %{SOURCE40} %{SOURCE41} %{SOURCE42} %{SOURCE38} %{SOURCE39} %{SOURCE43} .
 mkdir -p test_results
 %if %{test_on_wayland}
-./run-tests-wayland || true
+./run-tests-wayland %{test_offscreen} || true
 %else
 ./run-tests-x11 || true
 %endif
diff --git a/mozilla-1678247.patch b/mozilla-1678247.patch
new file mode 100644
index 0000000..5effad4
--- /dev/null
+++ b/mozilla-1678247.patch
@@ -0,0 +1,42 @@
+diff --git a/widget/gtk/MozContainerWayland.cpp b/widget/gtk/MozContainerWayland.cpp
+--- a/widget/gtk/MozContainerWayland.cpp
++++ b/widget/gtk/MozContainerWayland.cpp
+@@ -22,6 +22,7 @@
+ #  include "mozilla/Logging.h"
+ #  include "nsTArray.h"
+ #  include "Units.h"
++#  include "nsWindow.h"
+ extern mozilla::LazyLogModule gWidgetWaylandLog;
+ #  define LOGWAYLAND(args) \
+     MOZ_LOG(gWidgetWaylandLog, mozilla::LogLevel::Debug, args)
+@@ -343,21 +344,19 @@
+   moz_container_wayland_set_opaque_region_locked(container);
+ }
+ 
+-static int moz_gtk_widget_get_scale_factor(MozContainer* container) {
+-  static auto sGtkWidgetGetScaleFactor =
+-      (gint(*)(GtkWidget*))dlsym(RTLD_DEFAULT, "gtk_widget_get_scale_factor");
+-  return sGtkWidgetGetScaleFactor
+-             ? sGtkWidgetGetScaleFactor(GTK_WIDGET(container))
+-             : 1;
+-}
+-
+ static void moz_container_wayland_set_scale_factor_locked(
+     MozContainer* container) {
+   if (!container->wl_container.surface) {
+     return;
+   }
+-  wl_surface_set_buffer_scale(container->wl_container.surface,
+-                              moz_gtk_widget_get_scale_factor(container));
++  gpointer user_data = g_object_get_data(G_OBJECT(container), "nsWindow");
++  nsWindow* wnd = static_cast<nsWindow*>(user_data);
++
++  int scale = 1;
++  if (wnd) {
++    scale = wnd->GdkScaleFactor();
++  }
++  wl_surface_set_buffer_scale(container->wl_container.surface, scale);
+ }
+ 
+ void moz_container_wayland_set_scale_factor(MozContainer* container) {
+