diff --git a/projects/spidermonkey-ufi/Dockerfile b/projects/spidermonkey-ufi/Dockerfile
new file mode 100644
index 000000000..cea1b273c
--- /dev/null
+++ b/projects/spidermonkey-ufi/Dockerfile
@@ -0,0 +1,24 @@
+# Copyright 2019 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+################################################################################
+
+FROM gcr.io/oss-fuzz-base/base-builder
+MAINTAINER cdiehl@mozilla.com
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    autoconf2.13 \
+    python
+RUN git clone --depth=1 https://github.com/mozilla/gecko-dev mozilla-central
+WORKDIR mozilla-central/js/src/
+COPY build.sh target.c $SRC/
diff --git a/projects/spidermonkey-ufi/build.sh b/projects/spidermonkey-ufi/build.sh
new file mode 100755
index 000000000..2ed658cb7
--- /dev/null
+++ b/projects/spidermonkey-ufi/build.sh
@@ -0,0 +1,59 @@
+#!/bin/bash -eu
+# Copyright 2019 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+################################################################################
+
+# Case-sensitive names of internal Firefox fuzzing targets. Edit to add more.
+FUZZ_TARGETS=(
+  StructuredCloneReader
+  Wasm
+)
+
+# Install dependencies. Note that bootstrap installs cargo, which must be added
+# to PATH via source. In a successive run (for a different sanitizer), the
+# cargo installation carries over, but bootstrap fails if cargo is not in PATH.
+export SHELL=/bin/bash
+[[ -f "$HOME/.cargo/env" ]] && source $HOME/.cargo/env
+../../mach bootstrap --no-interactive --application-choice browser
+source $HOME/.cargo/env
+
+autoconf2.13
+
+# Update internal libFuzzer.
+(cd ../../tools/fuzzing/libfuzzer && ./clone_libfuzzer.sh HEAD)
+
+mkdir -p build_OPT.OBJ
+cd build_OPT.OBJ
+
+../configure \
+    --enable-optimize \
+    --disable-shared-js \
+    --disable-jemalloc \
+    --enable-tests \
+    --enable-fuzzing \
+    --enable-address-sanitizer
+
+make "-j$(nproc)"
+
+cp dist/bin/fuzz-tests $OUT
+
+# Build a wrapper binary for each target to set environment variables.
+for FUZZ_TARGET in ${FUZZ_TARGETS[@]}
+do
+  $CC $CFLAGS -O0 \
+    -DFUZZ_TARGET=$FUZZ_TARGET \
+    $SRC/target.c -o $OUT/$FUZZ_TARGET
+done
+
diff --git a/projects/spidermonkey-ufi/project.yaml b/projects/spidermonkey-ufi/project.yaml
new file mode 100644
index 000000000..8eb1f0e09
--- /dev/null
+++ b/projects/spidermonkey-ufi/project.yaml
@@ -0,0 +1,7 @@
+homepage: 'https://searchfox.org/mozilla-central/source/js/src/fuzz-tests/README'
+primary_contact: 'choller@mozilla.com'
+fuzzing_engines:
+  - libfuzzer
+sanitizers:
+  - address
+
diff --git a/projects/spidermonkey-ufi/target.c b/projects/spidermonkey-ufi/target.c
new file mode 100644
index 000000000..3538d29c9
--- /dev/null
+++ b/projects/spidermonkey-ufi/target.c
@@ -0,0 +1,39 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#define STRINGLIT(S) #S
+#define STRINGIFY(S) STRINGLIT(S)
+
+// Required for oss-fuzz to consider the binary a target.
+static const char* magic __attribute__((used)) = "LLVMFuzzerTestOneInput";
+
+int main(int argc, char* argv[]) {
+  setenv("HOME", "/tmp", 0);
+  setenv("LIBFUZZER", "1", 1);
+  setenv("FUZZER", STRINGIFY(FUZZ_TARGET), 1);
+
+  char* options = getenv("ASAN_OPTIONS");
+  if (options) {
+    char* ptr;
+    char* new_options = strdup(options);
+
+    // https://bugzilla.mozilla.org/1477846
+    ptr = strstr(new_options, "detect_stack_use_after_return=1");
+    if (ptr) ptr[30] = '0';
+
+    // https://bugzilla.mozilla.org/1477844
+    ptr = strstr(new_options, "detect_leaks=1");
+    if (ptr) ptr[13] = '0';
+
+    setenv("ASAN_OPTIONS", new_options, 1);
+    free(new_options);
+  }
+
+  int ret = execv("./fuzz-tests", argv);
+  if (ret)
+    perror("execv");
+  return ret;
+}
+