diff --git a/firefox.spec b/firefox.spec
index 669ffd7..9f1d693 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -94,7 +94,7 @@
 Summary:        Mozilla Firefox Web browser
 Name:           firefox
 Version:        50.0.2
-Release:        1%{?pre_tag}%{?dist}
+Release:        2%{?pre_tag}%{?dist}
 URL:            https://www.mozilla.org/firefox/
 License:        MPLv1.1 or GPLv2+ or LGPLv2+
 Group:          Applications/Internet
@@ -139,6 +139,7 @@ Patch406:        mozilla-256180.patch
 # Rebase Gtk3 widget code to latest trunk to
 # fix various rendering problems
 Patch407:        widget-rebase.patch
+Patch408:        mozilla-1271100.patch
 
 # Debian patches
 Patch500:        mozilla-440908.patch
@@ -284,6 +285,7 @@ cd %{tarballdir}
 # Rebase Gtk3 widget code to latest trunk to
 # fix various rendering problems
 %patch407 -p1 -b .widget-rebase
+%patch408 -p1 -b .1271100
 
 # Debian extension patch
 %patch500 -p1 -b .440908
@@ -792,7 +794,11 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 #---------------------------------------------------------------------
 
 %changelog
-* Mon Nov 30 2016 Martin Stransky <stransky@redhat.com> - 50.0.2-1
+* Wed Nov 30 2016 Martin Stransky <stransky@redhat.com> - 50.0.2-2
+- Added fix for "ABORT: X_ShmAttach: BadAccess" crashes
+  (mozbz#1271100)
+
+* Wed Nov 30 2016 Martin Stransky <stransky@redhat.com> - 50.0.2-1
 - Update to latest upstream (50.0.2)
 
 * Mon Nov 28 2016 Martin Stransky <stransky@redhat.com> - 50.0.1-1
diff --git a/mozilla-1271100.patch b/mozilla-1271100.patch
new file mode 100644
index 0000000..ee76024
--- /dev/null
+++ b/mozilla-1271100.patch
@@ -0,0 +1,37 @@
+# HG changeset patch
+# User Lee Salzman <lsalzman@mozilla.com>
+# Date 1480470918 18000
+#      Tue Nov 29 20:55:18 2016 -0500
+# Node ID ffc92a98adee4c3ebb1f3b8c593e913a74ef6a4a
+# Parent  8d8846f63b74eb930e48b410730ae088e9bdbee8
+work around race in system Cairo's XShm usage
+
+MozReview-Commit-ID: VGee6ungCz
+
+diff --git a/widget/gtk/mozgtk/mozgtk.c b/widget/gtk/mozgtk/mozgtk.c
+--- a/widget/gtk/mozgtk/mozgtk.c
++++ b/widget/gtk/mozgtk/mozgtk.c
+@@ -606,8 +606,23 @@ STUB(gdk_window_set_back_pixmap)
+ STUB(gdk_x11_colormap_foreign_new)
+ STUB(gdk_x11_colormap_get_xcolormap)
+ STUB(gdk_x11_drawable_get_xdisplay)
+ STUB(gdk_x11_drawable_get_xid)
+ STUB(gdk_x11_window_get_drawable_impl)
+ STUB(gdkx_visual_get)
+ STUB(gtk_object_get_type)
+ #endif
++
++#include <X11/Xlib.h>
++// Bug 1271100
++// We need to trick system Cairo into not using the XShm extension due to
++// a race condition in it that results in frequent BadAccess errors. Cairo
++// relies upon XShmQueryExtension to initially detect if XShm is available.
++// So we define our own stub that always indicates XShm not being present.
++// mozgtk loads before libXext/libcairo and so this stub will take priority.
++// Our tree usage goes through xcb and remains unaffected by this.
++MOZ_EXPORT Bool
++XShmQueryExtension(Display* aDisplay)
++{
++  return False;
++}
++