diff -up firefox-84.0.2/widget/gtk/WindowSurfaceWayland.cpp.old firefox-84.0.2/widget/gtk/WindowSurfaceWayland.cpp
--- firefox-84.0.2/widget/gtk/WindowSurfaceWayland.cpp.old	2021-01-18 21:39:44.724484655 +0100
+++ firefox-84.0.2/widget/gtk/WindowSurfaceWayland.cpp	2021-01-18 21:40:59.905703810 +0100
@@ -906,6 +906,8 @@ void WindowSurfaceWayland::CacheImageSur
                     size.width, size.height));
       }
 #endif
+    } else {
+      mDelayedImageCommits.AppendElement(lastSurf);
     }
   }