diff --git a/firefox.spec b/firefox.spec
index 8993c6c..238b9df 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -147,7 +147,7 @@ ExcludeArch: s390x
 Summary:        Mozilla Firefox Web browser
 Name:           firefox
 Version:        84.0.2
-Release:        5%{?pre_tag}%{?dist}
+Release:        6%{?pre_tag}%{?dist}
 URL:            https://www.mozilla.org/firefox/
 License:        MPLv1.1 or GPLv2+ or LGPLv2+
 Source0:        https://archive.mozilla.org/pub/firefox/releases/%{version}%{?pre_version}/source/firefox-%{version}%{?pre_version}.source.tar.xz
@@ -223,6 +223,7 @@ Patch418:        mozilla-1556931-s390x-hidden-syms.patch
 Patch420:        mozilla-1678680.patch
 Patch421:        mozilla-1680505.patch
 Patch422:        mozilla-1631061.patch
+Patch423:        mozilla-1681107.patch
 
 # Upstream patches from mozbz#1672944
 Patch450:        pw1.patch
@@ -451,6 +452,7 @@ This package contains results of tests executed during build.
 %patch420 -p1 -b .1678680
 %patch421 -p1 -b .1680505
 #%patch422 -p1 -b .1631061
+%patch423 -p1 -b .1681107
 
 %patch500 -p1 -b .ffvpx
 
@@ -1033,6 +1035,9 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 #---------------------------------------------------------------------
 
 %changelog
+* Thu Jan 15 2021 Martin Stransky <stransky@redhat.com> - 84.0.2-6
+- Added WebRender fix (mozbz#1681107).
+
 * Thu Jan 14 2021 Martin Stransky <stransky@redhat.com> - 84.0.2-5
 - Removed some failing tests.
 - Spec file tweaks.
diff --git a/mozilla-1681107.patch b/mozilla-1681107.patch
new file mode 100644
index 0000000..e228e35
--- /dev/null
+++ b/mozilla-1681107.patch
@@ -0,0 +1,47 @@
+
+# HG changeset patch
+# User sotaro <sotaro.ikeda.g@gmail.com>
+# Date 1610634595 0
+# Node ID c989e16ae8d0801b76efe712658abcbf3704a486
+# Parent  dc0d1d98e111aa781333980c2561f534ea1ebb0b
+Bug 1681107 - Fix race condition of calling CompositorBridgeChild::SendPause() r=rmader,stransky
+
+Differential Revision: https://phabricator.services.mozilla.com/D101693
+
+diff --git a/widget/gtk/nsWindow.cpp b/widget/gtk/nsWindow.cpp
+--- a/widget/gtk/nsWindow.cpp
++++ b/widget/gtk/nsWindow.cpp
+@@ -5085,23 +5085,29 @@ void nsWindow::NativeMoveResize() {
+   if (mNeedsShow && mIsShown) {
+     NativeShow(true);
+   }
+ }
+ 
+ void nsWindow::PauseRemoteRenderer() {
+ #ifdef MOZ_WAYLAND
+   if (!mIsDestroyed) {
+-    if (mContainer && moz_container_wayland_has_egl_window(mContainer)) {
++    if (mContainer) {
+       // Because wl_egl_window is destroyed on moz_container_unmap(),
+       // the current compositor cannot use it anymore. To avoid crash,
+       // pause the compositor and destroy EGLSurface & resume the compositor
+       // and re-create EGLSurface on next expose event.
+-      MOZ_ASSERT(GetRemoteRenderer());
+-      if (CompositorBridgeChild* remoteRenderer = GetRemoteRenderer()) {
++
++      // moz_container_wayland_has_egl_window() could not be used here, since
++      // there is a case that resume compositor is not completed yet.
++
++      CompositorBridgeChild* remoteRenderer = GetRemoteRenderer();
++      bool needsCompositorPause = !mNeedsCompositorResume && !!remoteRenderer &&
++                                  mCompositorWidgetDelegate;
++      if (needsCompositorPause) {
+         // XXX slow sync IPC
+         remoteRenderer->SendPause();
+         // Re-request initial draw callback
+         RefPtr<nsWindow> self(this);
+         moz_container_wayland_add_initial_draw_callback(
+             mContainer, [self]() -> void {
+               self->mNeedsCompositorResume = true;
+               self->MaybeResumeCompositor();
+