diff --git a/BUILD_ORDER b/BUILD_ORDER
index 9b99ee8..8157661 100644
--- a/BUILD_ORDER
+++ b/BUILD_ORDER
@@ -5,6 +5,7 @@ libxkbcommon
 setproctitle
 ptyprocess
 autoconf-archive
+mozjs
 cjs
 cracklib
 pam
diff --git a/build-cinnamon.sh b/build-cinnamon.sh
index 49abe21..1506b84 100755
--- a/build-cinnamon.sh
+++ b/build-cinnamon.sh
@@ -49,6 +49,7 @@ for dir in \
   setproctitle \
   ptyprocess \
   autoconf-archive \
+  mozjs \
   cjs \
   cracklib \
   pam \
diff --git a/mozjs/autoconf/autoconf.build b/mozjs/autoconf/autoconf.build
new file mode 100755
index 0000000..7dae1ba
--- /dev/null
+++ b/mozjs/autoconf/autoconf.build
@@ -0,0 +1,81 @@
+#!/bin/sh
+
+# Copyright 2005-2016  Patrick J. Volkerding, Sebeka, Minnesota, USA
+# All rights reserved.
+#
+# Redistribution and use of this script, with or without modification, is
+# permitted provided that the following conditions are met:
+#
+# 1. Redistributions of this script must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+#
+#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+#  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+#  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
+#  EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+#  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+#  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+#  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+#  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+#  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+PKGNAM=autoconf
+VERSION=2.13
+BUILD=${BUILD:-1}
+
+NUMJOBS=${NUMJOBS:-" -j7 "}
+
+# Automatically determine the architecture we're building on:
+if [ -z "$ARCH" ]; then
+  case "$( uname -m )" in
+    i?86) export ARCH=i486 ;;
+    arm*) export ARCH=arm ;;
+    # Unless $ARCH is already set, use uname -m for all other archs:
+       *) export ARCH=$( uname -m ) ;;
+  esac
+fi
+
+CWD=$(pwd)
+TMP=${TMP:-/tmp}
+PKG=$TMP/package-autoconf
+
+rm -rf $PKG
+mkdir -p $TMP $PKG
+
+cd $TMP
+rm -rf autoconf-$VERSION
+tar xvf $CWD/autoconf-$VERSION.tar.xz || exit 1
+cd autoconf-$VERSION
+
+zcat $CWD/autoconf-2.13-consolidated_fixes-1.patch.gz | patch -p1 --verbose || exit 1
+
+chown -R root:root .
+find . \
+  \( -perm 777 -o -perm 775 -o -perm 711 -o -perm 555 -o -perm 511 \) \
+  -exec chmod 755 {} \; -o \
+  \( -perm 666 -o -perm 664 -o -perm 600 -o -perm 444 -o -perm 440 -o -perm 400 \) \
+  -exec chmod 644 {} \;
+
+# Build a temporary copy of autoconf-2.13 only to be used to compile
+# Firefox, since it somewhat inexplicably requires this ancient version:
+
+rm -rf $TMP/autoconf-tmp
+mkdir -p $TMP/autoconf-tmp
+# This will be at the beginning of the $PATH, so protect against nonsense
+# happening in /tmp:
+chmod 700 $TMP/autoconf-tmp
+rm -rf $TMP/autoconf-tmp/*
+mkdir -p $TMP/autoconf-tmp/usr
+
+./configure \
+  --prefix=$TMP/autoconf-tmp/usr \
+  --program-suffix=-2.13 \
+  --infodir=$TMP/autoconf-tmp/usr/info \
+  --mandir=$TMP/autoconf-tmp/usr/man \
+  --build=$ARCH-slackware-linux || exit 1
+
+make $NUMJOBS || make || exit 1
+make install || exit 1
+
diff --git a/mozjs/mozjs.SlackBuild b/mozjs/mozjs.SlackBuild
new file mode 100644
index 0000000..a0d2a65
--- /dev/null
+++ b/mozjs/mozjs.SlackBuild
@@ -0,0 +1,132 @@
+#!/bin/sh
+
+# Slackware build script for mozjs
+
+# Copyright 2015 Willy Sudiarto Raharjo <willysr@slackware-id.org>
+# All rights reserved.
+#
+# Redistribution and use of this script, with or without modification, is
+# permitted provided that the following conditions are met:
+#
+# 1. Redistributions of this script must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+#
+#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
+#  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+#  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
+#  EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+#  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+#  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+#  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+#  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+#  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+PRGNAM=mozjs
+VERSION=${VERSION:-52.9.0}
+SRCNAM=firefox-${VERSION}esr.source
+DIRNAM=firefox-${VERSION}
+BUILD=${BUILD:-1}
+TAG=${TAG:-_csb}
+
+if [ -z "$ARCH" ]; then
+  case "$( uname -m )" in
+    i?86) ARCH=i586 ;;
+    arm*) ARCH=arm ;;
+       *) ARCH=$( uname -m ) ;;
+  esac
+fi
+
+wget -c https://ftp.mozilla.org/pub/firefox/releases/52.9.0esr/source/firefox-52.9.0esr.source.tar.xz
+
+CWD=$(pwd)
+TMP=${TMP:-/tmp/csb}
+PKG=$TMP/package-$PRGNAM
+OUTPUT=${OUTPUT:-/tmp}
+
+if [ "$ARCH" = "i586" ]; then
+  SLKCFLAGS="-O2 -march=i586 -mtune=i686"
+  LIBDIRSUFFIX=""
+elif [ "$ARCH" = "i686" ]; then
+  SLKCFLAGS="-O2 -march=i686 -mtune=i686"
+  LIBDIRSUFFIX=""
+elif [ "$ARCH" = "x86_64" ]; then
+  SLKCFLAGS="-O2 -fPIC"
+  LIBDIRSUFFIX="64"
+else
+  SLKCFLAGS="-O2"
+  LIBDIRSUFFIX=""
+fi
+
+set -e
+
+rm -rf $PKG
+mkdir -p $TMP $PKG $OUTPUT $PKG/usr/lib${LIBDIRSUFFIX}
+
+# We need to use the incredibly ancient autoconf-2.13 for this  :/
+(
+cd $CWD/autoconf
+wget -c http://slackware.osuosl.org/slackware64-14.2/patches/source/mozilla-firefox/autoconf/autoconf-2.13.tar.xz
+./autoconf.build
+)
+PATH=$TMP/autoconf-tmp/usr/bin:$PATH
+
+cd $TMP
+rm -rf firefox-unpack ${DIRNAM}esr
+mkdir firefox-unpack
+cd firefox-unpack
+tar xvf $CWD/$SRCNAM.tar.xz
+mv * ..
+cd ..
+rm -rf firefox-unpack
+cd ${DIRNAM}esr
+chown -R root:root .
+find -L . \
+ \( -perm 777 -o -perm 775 -o -perm 750 -o -perm 711 -o -perm 555 \
+  -o -perm 511 \) -exec chmod 755 {} \; -o \
+ \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
+  -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;
+
+# Taken from ARCH
+patch -p1 < $CWD/mozjs52-fix-soname.patch
+patch -p1 < $CWD/mozjs52-copy-headers.patch
+patch -p1 < $CWD/mozjs52-disable-mozglue.patch
+patch -Np1 < $CWD/mozjs52-include-configure-script.patch
+touch js/src/configure
+
+cd js/src
+CFLAGS="$SLKCFLAGS -fno-delete-null-pointer-checks -fpermissive -fno-tree-vrp -fno-strict-aliasing" \
+CXXFLAGS="$SLKCFLAGS -fno-delete-null-pointer-checks -fpermissive -fno-tree-vrp -fno-strict-aliasing" \
+./configure \
+  --prefix=/usr \
+  --libdir=/usr/lib${LIBDIRSUFFIX} \
+  --disable-debug \
+  --disable-debug-symbols \
+  --disable-strip \
+  --enable-optimize="-O2" \
+  --enable-pie \
+  --enable-posix-nspr-emulation \
+  --enable-release \
+  --with-intl-api \
+  --with-system-zlib \
+  --enable-shared-js
+
+make
+make DESTDIR=$PKG install
+
+find $PKG -print0 | xargs -0 file | grep -e "executable" -e "shared object" | grep ELF \
+  | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null || true
+
+cd ../..
+
+mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
+cp -a AUTHORS LEGAL LICENSE README.txt $PKG/usr/doc/$PRGNAM-$VERSION
+cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild
+find $PKG/usr/doc/$PRGNAM-$VERSION/ -type f -exec chmod 644 {} \;
+chown -R root:root $PKG/usr/doc/$PRGNAM-$VERSION
+
+mkdir -p $PKG/install
+cat $CWD/slack-desc > $PKG/install/slack-desc
+
+cd $PKG
+/sbin/makepkg -l y -c n $OUTPUT/$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.${PKGTYPE:-txz}
diff --git a/mozjs/mozjs52-copy-headers.patch b/mozjs/mozjs52-copy-headers.patch
new file mode 100644
index 0000000..69b2161
--- /dev/null
+++ b/mozjs/mozjs52-copy-headers.patch
@@ -0,0 +1,30 @@
+From 8b2d7a77bfb4dbd513763501ed7e9722058ee9af Mon Sep 17 00:00:00 2001
+From: Rico Tzschichholz <ricotz@ubuntu.com>
+Date: Wed, 5 Jul 2017 22:45:59 -0700
+Subject: [PATCH] build: Copy headers on install instead of symlinking
+
+Patch ported forward to mozjs52 by Philip Chimento
+<philip.chimento@gmail.com>.
+---
+ python/mozbuild/mozbuild/backend/recursivemake.py | 6 +++---
+ 1 file changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/python/mozbuild/mozbuild/backend/recursivemake.py b/python/mozbuild/mozbuild/backend/recursivemake.py
+index 132dcf94..33d489a6 100644
+--- a/python/mozbuild/mozbuild/backend/recursivemake.py
++++ b/python/mozbuild/mozbuild/backend/recursivemake.py
+@@ -1307,11 +1307,11 @@ def _process_final_target_files(self, obj, files, backend_file):
+                                 raise Exception("Wildcards are only supported in the filename part of "
+                                                 "srcdir-relative or absolute paths.")
+ 
+-                            install_manifest.add_pattern_symlink(basepath, wild, path)
++                            install_manifest.add_pattern_copy(basepath, wild, path)
+                         else:
+-                            install_manifest.add_pattern_symlink(f.srcdir, f, path)
++                            install_manifest.add_pattern_copy(f.srcdir, f, path)
+                     else:
+-                        install_manifest.add_symlink(f.full_path, dest)
++                        install_manifest.add_copy(f.full_path, dest)
+                 else:
+                     install_manifest.add_optional_exists(dest)
+                     backend_file.write('%s_FILES += %s\n' % (
diff --git a/mozjs/mozjs52-disable-mozglue.patch b/mozjs/mozjs52-disable-mozglue.patch
new file mode 100644
index 0000000..8355cf4
--- /dev/null
+++ b/mozjs/mozjs52-disable-mozglue.patch
@@ -0,0 +1,66 @@
+From 7e6d628456af3e99ebcb9a01a27e1461585082a4 Mon Sep 17 00:00:00 2001
+From: Till Schneidereit <till@tillschneidereit.net>
+Date: Thu, 1 Oct 2015 12:59:09 +0200
+Subject: [PATCH] Disable MOZ_GLUE_IN_PROGRAM in stand-alone builds on all
+ platforms
+
+Otherwise, build fails not being able to find HashBytes.
+
+Patch ported forward to mozjs52 by Philip Chimento
+<philip.chimento@gmail.com>.
+
+https://bugzilla.mozilla.org/show_bug.cgi?id=1176787
+---
+ js/src/old-configure.in | 23 ++++++++++++++---------
+ mozglue/build/moz.build |  2 +-
+ 2 files changed, 15 insertions(+), 10 deletions(-)
+
+diff --git a/js/src/old-configure.in b/js/src/old-configure.in
+index 1c5c9e21..ff0617e3 100644
+--- a/js/src/old-configure.in
++++ b/js/src/old-configure.in
+@@ -1623,16 +1623,21 @@ dnl ========================================================
+ dnl = Enable jemalloc
+ dnl ========================================================
+ 
+-case "${OS_TARGET}" in
+-Android|WINNT|Darwin)
++dnl In stand-alone builds we always only want to link executables against mozglue.
++if test "$JS_STANDALONE"; then
+   MOZ_GLUE_IN_PROGRAM=
+-  ;;
+-*)
+-  dnl On !Android !Windows !OSX, we only want to link executables against mozglue
+-  MOZ_GLUE_IN_PROGRAM=1
+-  AC_DEFINE(MOZ_GLUE_IN_PROGRAM)
+-  ;;
+-esac
++else
++  case "${OS_TARGET}" in
++  Android|WINNT|Darwin)
++    MOZ_GLUE_IN_PROGRAM=
++    ;;
++  *)
++    dnl On !Android !Windows !OSX, we only want to link executables against mozglue
++    MOZ_GLUE_IN_PROGRAM=1
++    AC_DEFINE(MOZ_GLUE_IN_PROGRAM)
++    ;;
++  esac
++fi
+ 
+ if test "$MOZ_MEMORY"; then
+   if test "x$MOZ_DEBUG" = "x1"; then
+diff --git a/mozglue/build/moz.build b/mozglue/build/moz.build
+index d2897477..e3be5a2b 100644
+--- a/mozglue/build/moz.build
++++ b/mozglue/build/moz.build
+@@ -6,7 +6,7 @@
+ 
+ # Build mozglue as a shared lib on Windows, OSX and Android.
+ # If this is ever changed, update MOZ_SHARED_MOZGLUE in browser/installer/Makefile.in
+-if CONFIG['OS_TARGET'] in ('WINNT', 'Darwin', 'Android'):
++if CONFIG['OS_TARGET'] in ('WINNT', 'Darwin', 'Android') and not CONFIG['JS_STANDALONE']:
+     SharedLibrary('mozglue')
+ else:
+     Library('mozglue')
+
diff --git a/mozjs/mozjs52-fix-soname.patch b/mozjs/mozjs52-fix-soname.patch
new file mode 100644
index 0000000..a91107c
--- /dev/null
+++ b/mozjs/mozjs52-fix-soname.patch
@@ -0,0 +1,34 @@
+From: Laszlo Boszormenyi (GCS) <gcs@debian.org>
+Date: Fri, 02 May 2014 22:20:45 +0200
+Subject: fix soname
+
+Add soname switch to linker, regardless of Operating System
+
+Bug-Debian: http://bugs.debian.org/746705
+---
+ config/rules.mk | 5 +++--
+ 1 file changed, 3 insertions(+), 2 deletions(-)
+
+Index: mozjs52-52.2.1~artful1/config/rules.mk
+===================================================================
+--- mozjs52-52.2.1~artful1.orig/config/rules.mk
++++ mozjs52-52.2.1~artful1/config/rules.mk
+@@ -418,7 +418,7 @@ endif # AIX
+ #
+ # Linux: add -Bsymbolic flag for components
+ #
+-ifeq ($(OS_ARCH),Linux)
++#ifeq ($(OS_ARCH),Linux)
+ ifdef IS_COMPONENT
+ EXTRA_DSO_LDOPTS += -Wl,-Bsymbolic
+ endif
+@@ -426,7 +426,8 @@ ifdef LD_VERSION_SCRIPT
+ EXTRA_DSO_LDOPTS += -Wl,--version-script,$(LD_VERSION_SCRIPT)
+ EXTRA_DEPS += $(LD_VERSION_SCRIPT)
+ endif
+-endif
++#endif
++EXTRA_DSO_LDOPTS += -Wl,-soname,lib$(JS_LIBRARY_NAME).so.0
+ 
+ ifdef SYMBOLS_FILE
+ ifeq ($(OS_TARGET),WINNT)
diff --git a/mozjs/mozjs52-include-configure-script.patch b/mozjs/mozjs52-include-configure-script.patch
new file mode 100644
index 0000000..c24d7b1
--- /dev/null
+++ b/mozjs/mozjs52-include-configure-script.patch
@@ -0,0 +1,48 @@
+From 4a06a1a6a71293decb83aee7adb74bc709493106 Mon Sep 17 00:00:00 2001
+From: Philip Chimento <philip.chimento@gmail.com>
+Date: Wed, 5 Jul 2017 22:57:09 -0700
+Subject: [PATCH] build: Include configure script, be nicer about options
+
+A configure script is not included in the SpiderMonkey tarball by
+default. Also, we have to account for JHbuild passing extra unknown
+options like --disable-Werror.
+
+https://bugzilla.mozilla.org/show_bug.cgi?id=1379540
+---
+ js/src/configure                               | 9 +++++++++
+ python/mozbuild/mozbuild/configure/__init__.py | 2 +-
+ python/mozbuild/mozbuild/configure/options.py  | 6 +++++-
+ 3 files changed, 15 insertions(+), 2 deletions(-)
+ create mode 100755 js/src/configure
+
+diff --git a/python/mozbuild/mozbuild/configure/__init__.py b/python/mozbuild/mozbuild/configure/__init__.py
+index 0fe640ca..09b460d3 100644
+--- a/python/mozbuild/mozbuild/configure/__init__.py
++++ b/python/mozbuild/mozbuild/configure/__init__.py
+@@ -356,7 +356,7 @@ def run(self, path=None):
+         # All options should have been removed (handled) by now.
+         for arg in self._helper:
+             without_value = arg.split('=', 1)[0]
+-            raise InvalidOptionError('Unknown option: %s' % without_value)
++            print('Ignoring', without_value, ': Unknown option')
+ 
+         # Run the execution queue
+         for func, args in self._execution_queue:
+diff --git a/python/mozbuild/mozbuild/configure/options.py b/python/mozbuild/mozbuild/configure/options.py
+index 4310c862..15bfe425 100644
+--- a/python/mozbuild/mozbuild/configure/options.py
++++ b/python/mozbuild/mozbuild/configure/options.py
+@@ -402,7 +402,11 @@ def __init__(self, environ=os.environ, argv=sys.argv):
+ 
+     def add(self, arg, origin='command-line', args=None):
+         assert origin != 'default'
+-        prefix, name, values = Option.split_option(arg)
++        try:
++            prefix, name, values = Option.split_option(arg)
++        except InvalidOptionError as e:
++            print('Ignoring', arg, ':', e)
++            return
+         if args is None:
+             args = self._extra_args
+         if args is self._extra_args and name in self._extra_args:
+
diff --git a/mozjs/slack-desc b/mozjs/slack-desc
new file mode 100644
index 0000000..ac5233f
--- /dev/null
+++ b/mozjs/slack-desc
@@ -0,0 +1,12 @@
+     |-----handy-ruler------------------------------------------------------|
+mozjs: mozjs (JS Binding)
+mozjs:
+mozjs: SpiderMonkey is Mozilla's JavaScript engine written in C/C++.
+mozjs: It is used in various Mozilla products, including Firefox, and
+mozjs:  is available under the MPL2.
+mozjs:
+mozjs:
+mozjs:
+mozjs:
+mozjs:
+mozjs: