diff --git a/SPECS/mozjs60.spec b/SPECS/mozjs60.spec
new file mode 100644
index 0000000..ebcb9d2
--- /dev/null
+++ b/SPECS/mozjs60.spec
@@ -0,0 +1,361 @@
+%global major 60
+
+# Require libatomic for ppc
+%ifarch ppc
+%global system_libatomic 1
+%endif
+
+# Big endian platforms
+%ifarch ppc ppc64 s390 s390x
+%global big_endian 1
+%endif
+
+Name: mozjs%{major}
+Version: 60.9.0
+Release: 4%{?dist}
+Summary: SpiderMonkey JavaScript library
+
+License: MPLv2.0 and MPLv1.1 and BSD and GPLv2+ and GPLv3+ and LGPLv2+ and AFL and ASL 2.0
+URL: https://developer.mozilla.org/en-US/docs/Mozilla/Projects/SpiderMonkey
+Source0: https://ftp.mozilla.org/pub/firefox/releases/%{version}esr/source/firefox-%{version}esr.source.tar.xz
+
+# Patches from Debian mozjs52_52.3.1-4.debian.tar.xz:
+Patch0001: fix-soname.patch
+Patch0002: copy-headers.patch
+Patch0003: tests-increase-timeout.patch
+Patch0008: Always-use-the-equivalent-year-to-determine-the-time-zone.patch
+Patch0009: icu_sources_data.py-Decouple-from-Mozilla-build-system.patch
+Patch0010: icu_sources_data-Write-command-output-to-our-stderr.patch
+Patch0011: tests-For-tests-that-are-skipped-on-64-bit-mips64-is-also.patch
+
+# Build fixes - https://hg.mozilla.org/mozilla-central/rev/ca36a6c4f8a4a0ddaa033fdbe20836d87bbfb873
+Patch12: emitter.patch
+Patch13: emitter_test.patch
+Patch14: init_patch.patch
+
+# s390x fixes:
+# https://salsa.debian.org/gnome-team/mozjs60/blob/debian/master/debian/patches/enddianness.patch
+Patch15: enddianness.patch
+# https://salsa.debian.org/gnome-team/mozjs60/blob/debian/master/debian/patches/jsproperty-endian.patch
+Patch16: jsproperty-endian.patch
+# https://salsa.debian.org/gnome-team/mozjs60/blob/debian/master/debian/patches/tests-Skip-a-test-on-s390x.patch
+Patch17: tests-Skip-a-test-on-s390x.patch
+# https://salsa.debian.org/gnome-team/mozjs60/blob/debian/master/debian/patches/tests-Expect-a-test-to-fail-on-big-endian.patch
+Patch18: tests-Expect-a-test-to-fail-on-big-endian.patch
+
+# Patches from Fedora firefox package:
+Patch26: build-icu-big-endian.patch
+
+# aarch64 fixes for -O2
+Patch30: Save-x28-before-clobbering-it-in-the-regex-compiler.patch
+Patch31: Save-and-restore-non-volatile-x28-on-ARM64-for-generated-unboxed-object-constructor.patch
+
+BuildRequires: autoconf213
+BuildRequires: gcc
+BuildRequires: gcc-c++
+BuildRequires: perl-devel
+BuildRequires: pkgconfig(libffi)
+BuildRequires: pkgconfig(zlib)
+BuildRequires: python2-devel
+BuildRequires: readline-devel
+BuildRequires: /usr/bin/zip
+%if 0%{?system_libatomic}
+BuildRequires: libatomic
+%endif
+
+# Firefox does not allow to build with system version of jemalloc
+Provides: bundled(jemalloc) = 4.3.1
+
+%description
+SpiderMonkey is the code-name for Mozilla Firefox's C++ implementation of
+JavaScript. It is intended to be embedded in other applications
+that provide host environments for JavaScript.
+
+%package devel
+Summary: Development files for %{name}
+Requires: %{name}%{?_isa} = %{version}-%{release}
+
+%description devel
+The %{name}-devel package contains libraries and header files for
+developing applications that use %{name}.
+
+%prep
+%setup -q -n firefox-%{version}/js/src
+
+pushd ../..
+%patch0001 -p1
+%patch0002 -p1
+%patch0003 -p1
+%patch0008 -p1
+%patch0009 -p1
+%patch0010 -p1
+%patch0011 -p1
+
+%patch12 -p1
+%patch13 -p1
+%patch14 -p1
+
+# s390x fixes
+%patch15 -p1
+%patch16 -p1
+%patch17 -p1
+%patch18 -p1
+
+# Patch for big endian platforms only
+%if 0%{?big_endian}
+%patch26 -p1 -b .icu
+%endif
+
+# aarch64 -O2 fixes
+%ifarch aarch64
+%patch30 -p1
+%patch31 -p1
+%endif
+
+# make sure we don't ever accidentally link against bundled security libs
+rm -rf security/
+popd
+
+# Remove zlib directory (to be sure using system version)
+rm -rf ../../modules/zlib
+
+%build
+export CFLAGS="%{optflags}"
+
+export CXXFLAGS="$CFLAGS"
+export LINKFLAGS="%{?__global_ldflags}"
+export PYTHON="%{__python2}"
+# Keep using Python 2 for the build for now
+# https://bugzilla.redhat.com/show_bug.cgi?id=1610009
+export RHEL_ALLOW_PYTHON2_FOR_BUILD=1
+
+autoconf-2.13
+%configure \
+ --without-system-icu \
+ --enable-posix-nspr-emulation \
+ --with-system-zlib \
+ --enable-tests \
+ --disable-strip \
+ --with-intl-api \
+ --enable-readline \
+ --enable-shared-js \
+ --disable-optimize \
+ --enable-pie \
+ --disable-jemalloc \
+
+%if 0%{?big_endian}
+echo "Generate big endian version of config/external/icu/data/icud58l.dat"
+pushd ../..
+ ./mach python intl/icu_sources_data.py .
+ ls -l config/external/icu/data
+ rm -f config/external/icu/data/icudt*l.dat
+popd
+%endif
+
+%make_build
+
+%install
+# Keep using Python 2 for the build for now
+# https://bugzilla.redhat.com/show_bug.cgi?id=1610009
+export RHEL_ALLOW_PYTHON2_FOR_BUILD=1
+
+%make_install
+
+# Fix permissions
+chmod -x %{buildroot}%{_libdir}/pkgconfig/*.pc
+
+# Avoid multilib conflicts
+case `uname -i` in
+ i386 | ppc | s390 | sparc )
+ wordsize="32"
+ ;;
+ x86_64 | ppc64 | s390x | sparc64 )
+ wordsize="64"
+ ;;
+ *)
+ wordsize=""
+ ;;
+esac
+
+if test -n "$wordsize"
+then
+ mv %{buildroot}%{_includedir}/mozjs-60/js-config.h \
+ %{buildroot}%{_includedir}/mozjs-60/js-config-$wordsize.h
+
+ cat >%{buildroot}%{_includedir}/mozjs-60/js-config.h <<EOF
+#ifndef JS_CONFIG_H_MULTILIB
+#define JS_CONFIG_H_MULTILIB
+
+#include <bits/wordsize.h>
+
+#if __WORDSIZE == 32
+# include "js-config-32.h"
+#elif __WORDSIZE == 64
+# include "js-config-64.h"
+#else
+# error "unexpected value for __WORDSIZE macro"
+#endif
+
+#endif
+EOF
+
+fi
+
+# Remove unneeded files
+rm %{buildroot}%{_bindir}/js%{major}
+rm %{buildroot}%{_bindir}/js%{major}-config
+rm %{buildroot}%{_libdir}/libjs_static.ajs
+
+# Rename library and create symlinks, following fix-soname.patch
+mv %{buildroot}%{_libdir}/libmozjs-%{major}.so \
+ %{buildroot}%{_libdir}/libmozjs-%{major}.so.0.0.0
+ln -s libmozjs-%{major}.so.0.0.0 %{buildroot}%{_libdir}/libmozjs-%{major}.so.0
+ln -s libmozjs-%{major}.so.0 %{buildroot}%{_libdir}/libmozjs-%{major}.so
+
+%check
+# Run SpiderMonkey tests
+python2 tests/jstests.py -d -s -t 1800 --no-progress ../../js/src/js/src/shell/js \
+%ifarch %{ix86} x86_64 %{arm} aarch64 ppc ppc64le s390x
+;
+%else
+|| :
+%endif
+
+# Run basic JIT tests
+python2 jit-test/jit_test.py -s -t 1800 --no-progress ../../js/src/js/src/shell/js basic \
+%ifarch %{ix86} x86_64 %{arm} aarch64 ppc ppc64le s390x
+;
+%else
+|| :
+%endif
+
+%ldconfig_scriptlets
+
+%files
+%doc README.html
+%{_libdir}/libmozjs-%{major}.so.0*
+
+%files devel
+%{_libdir}/libmozjs-%{major}.so
+%{_libdir}/pkgconfig/*.pc
+%{_includedir}/mozjs-%{major}/
+
+%changelog
+* Mon Feb 17 2020 Kalev Lember <klember@redhat.com> - 60.9.0-4
+- Update enddianness.patch with more s390x fixes
+- Enable tests on s390x again
+- Resolves: #1803824
+
+* Tue Sep 10 2019 Kalev Lember <klember@redhat.com> - 60.9.0-3
+- Fix multilib conflicts in js-config.h
+
+* Sat Sep 07 2019 Kalev Lember <klember@redhat.com> - 60.9.0-2
+- Backport patches for s390x support
+- Resolves: #1746889
+
+* Tue Sep 03 2019 Kalev Lember <klember@redhat.com> - 60.9.0-1
+- Update to 60.9.0
+
+* Wed May 29 2019 Kalev Lember <klember@redhat.com> - 60.7.0-2
+- Enable gating
+
+* Tue May 21 2019 Kalev Lember <klember@redhat.com> - 60.7.0-1
+- Update to 60.7.0
+
+* Mon Apr 15 2019 Frantisek Zatloukal <fzatlouk@redhat.com> - 60.6.1-2
+- Backport two Firefox 61 patches and allow compiler optimizations on aarch64
+
+* Sun Apr 14 2019 Frantisek Zatloukal <fzatlouk@redhat.com> - 60.6.1-1
+- Update to 60.6.1
+
+* Thu Feb 21 2019 Frantisek Zatloukal <fzatlouk@redhat.com> - 60.4.0-5
+- Re-enable null pointer gcc optimization
+
+* Sun Feb 17 2019 Igor Gnatenko <ignatenkobrain@fedoraproject.org> - 60.4.0-4
+- Rebuild for readline 8.0
+
+* Thu Feb 14 2019 Frantisek Zatloukal <fzatlouk@redhat.com> - 60.4.0-3
+- Build aarch64 with -O0 because of rhbz#1676292
+
+* Fri Feb 01 2019 Fedora Release Engineering <releng@fedoraproject.org> - 60.4.0-2
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_30_Mass_Rebuild
+
+* Wed Jan 02 2019 Frantisek Zatloukal <fzatlouk@redhat.com> - 60.4.0-1
+- Update to 60.4.0
+
+* Mon Nov 12 2018 Kalev Lember <klember@redhat.com> - 60.3.0-1
+- Update to 60.3.0
+
+* Thu Oct 04 2018 Kalev Lember <klember@redhat.com> - 60.2.2-1
+- Update to 60.2.2
+
+* Fri Sep 28 2018 Kalev Lember <klember@redhat.com> - 60.2.1-1
+- Update to 60.2.1
+
+* Tue Sep 11 2018 Kalev Lember <klember@redhat.com> - 60.2.0-1
+- Update to 60.2.0
+
+* Tue Sep 04 2018 Frantisek Zatloukal <fzatlouk@redhat.com> - 60.1.0-1
+- Update to 60.1.0
+
+* Wed Jul 25 2018 Kalev Lember <klember@redhat.com> - 52.9.0-1
+- Update to 52.9.0
+
+* Fri Jul 13 2018 Fedora Release Engineering <releng@fedoraproject.org> - 52.8.0-3
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_29_Mass_Rebuild
+
+* Mon Jun 11 2018 Ray Strode <rstrode@redhat.com> - 52.8.0-2
+- safeguard against linking against bundled nss
+ Related: #1563708
+
+* Fri May 11 2018 Kalev Lember <klember@redhat.com> - 52.8.0-1
+- Update to 52.8.0
+- Fix the build on ppc
+- Disable JS Helper threads on ppc64le (#1523121)
+
+* Sat Apr 07 2018 Kalev Lember <klember@redhat.com> - 52.7.3-1
+- Update to 52.7.3
+
+* Tue Mar 20 2018 Kalev Lember <klember@redhat.com> - 52.7.2-1
+- Update to 52.7.2
+- Switch to %%ldconfig_scriptlets
+
+* Thu Feb 08 2018 Fedora Release Engineering <releng@fedoraproject.org> - 52.6.0-2
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild
+
+* Tue Jan 23 2018 Kalev Lember <klember@redhat.com> - 52.6.0-1
+- Update to 52.6.0
+
+* Fri Nov 24 2017 Björn Esser <besser82@fedoraproject.org> - 52.5.0-5
+- SpiderMonkey tests have regressions on %%{power64}, too
+
+* Fri Nov 24 2017 Björn Esser <besser82@fedoraproject.org> - 52.5.0-4
+- SpiderMonkey tests have regressions on big endian platforms
+
+* Fri Nov 24 2017 Björn Esser <besser82@fedoraproject.org> - 52.5.0-3
+- SpiderMonkey tests do not fail on any arch
+- Basic JIT tests are failing on s390 arches, only
+- Use macro for ppc64 arches
+- Run tests using Python2 explicitly
+- Simplify %%check
+- Use the %%{major} macro consequently
+- Replace %%define with %%global
+
+* Fri Nov 24 2017 Björn Esser <besser82@fedoraproject.org> - 52.5.0-2
+- Use macro for Python 2 interpreter
+- Use proper export and quoting
+
+* Tue Nov 14 2017 Kalev Lember <klember@redhat.com> - 52.5.0-1
+- Update to 52.5.0
+
+* Tue Oct 31 2017 Kalev Lember <klember@redhat.com> - 52.4.0-3
+- Include standalone /usr/bin/js52 interpreter
+
+* Tue Oct 31 2017 Kalev Lember <klember@redhat.com> - 52.4.0-2
+- Various secondary arch fixes
+
+* Thu Sep 28 2017 Kalev Lember <klember@redhat.com> - 52.4.0-1
+- Update to 52.4.0
+
+* Wed Sep 20 2017 Kalev Lember <klember@redhat.com> - 52.3.0-1
+- Initial Fedora packaging, based on earlier mozjs45 work