diff --git a/firefox.spec b/firefox.spec
index 6dfb8a0..542b193 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -431,6 +431,12 @@ MOZ_LINK_FLAGS="$MOZ_LINK_FLAGS -fsanitize=address -ldl"
 %endif
 MOZ_OPT_FLAGS="$MOZ_OPT_FLAGS -DNSS_PKCS11_3_0_STRICT"
 %if !%{build_with_clang}
+%ifarch x86_64
+MOZ_OPT_FLAGS='-O2 -g -pipe   -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/openEuler/openEuler-hardened-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables  -fpermissive -fPIC -Wl,-z,relro -Wl,-z,now -DNSS_PKCS11_3_0_STRICT'
+%endif
+%ifarch aarch64
+MOZ_OPT_FLAGS='-O2 -g -pipe   -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/openEuler/openEuler-hardened-cc1 -mabi=lp64 -mtune=generic -fasynchronous-unwind-tables  -fpermissive -fPIC -Wl,-z,relro -Wl,-z,now -DNSS_PKCS11_3_0_STRICT'
+%endif
 echo "export CFLAGS=\"$MOZ_OPT_FLAGS\"" >> .mozconfig
 echo "export CXXFLAGS=\"$MOZ_OPT_FLAGS\"" >> .mozconfig
 echo "export LDFLAGS=\"$MOZ_LINK_FLAGS\"" >> .mozconfig
@@ -732,7 +738,7 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 
 %changelog
 * Wed Oct 14 2020 Jeffery.Gao <gaojianxing@huawei.com> - 79.0-1
-- Update to 79.0-1
+- Update to 79.0-1 and switch off -fstack_clash_protection compiler option
 
 * Wed Jul 22 2020 lingsheng <lingsheng@huawei.com> - 62.0.3-7
 - Fix firefox build with rust 1.38