diff --git a/dom/plugins/base/nsPluginHost.cpp b/dom/plugins/base/nsPluginHost.cpp

--- a/dom/plugins/base/nsPluginHost.cpp

+++ b/dom/plugins/base/nsPluginHost.cpp

@@ -105,6 +105,10 @@

 #  include "windows.h"

 #  include "winbase.h"

 #endif

+#if (MOZ_WIDGET_GTK)

+#  include <gdk/gdk.h>

+#  include <gdk/gdkx.h>

+#endif

 #include "npapi.h"

@@ -358,9 +362,15 @@

   mOverrideInternalTypes =

       Preferences::GetBool("plugin.override_internal_types", false);

-  mPluginsDisabled = Preferences::GetBool("plugin.disable", false);

-

-  Preferences::AddStrongObserver(this, "plugin.disable");

+  bool waylandBackend = false;

+#if MOZ_WIDGET_GTK

+  waylandBackend = !GDK_IS_X11_DISPLAY(gdk_display_get_default());

+#endif

+  mPluginsDisabled =

+      Preferences::GetBool("plugin.disable", false) || waylandBackend;

+  if (!waylandBackend) {

+    Preferences::AddStrongObserver(this, "plugin.disable");

+  }

   nsCOMPtr<nsIObserverService> obsService =

       mozilla::services::GetObserverService();