diff --git a/projects/firefox/Dockerfile b/projects/firefox/Dockerfile
index 515e9df26..e5343c9ee 100644
--- a/projects/firefox/Dockerfile
+++ b/projects/firefox/Dockerfile
@@ -24,11 +24,16 @@ RUN apt-get update && \
       gawk \
       libstdc++6 \
       m4 \
-      python
+      python python3-pip python3-setuptools python3-wheel cmake git nasm 
+RUN pip3 install meson ninja
 
 # This wrapper of cargo seems to interfere with our build system.
 RUN rm -f /usr/local/bin/cargo
 
+RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs > $SRC/rustbuild.sh && \
+    chmod +x $SRC/rustbuild.sh && \
+    $SRC/rustbuild.sh -y
+
 RUN git clone --depth 1 https://github.com/mozilla/gecko-dev mozilla-central
 RUN git clone --depth 1 https://github.com/mozillasecurity/fuzzdata
 WORKDIR mozilla-central
diff --git a/projects/firefox/build.sh b/projects/firefox/build.sh
index 8788e190e..71f7f6b12 100755
--- a/projects/firefox/build.sh
+++ b/projects/firefox/build.sh
@@ -15,6 +15,14 @@
 #
 ################################################################################
 
+if [ "$SANITIZER" = "coverage" ]
+then
+  touch $OUT/exit
+  exit 0
+fi
+
+source $HOME/.cargo/env
+
 # Case-sensitive names of internal Firefox fuzzing targets. Edit to add more.
 FUZZ_TARGETS=(
   # WebRTC
@@ -48,14 +56,7 @@ export ASAN_OPTIONS="detect_leaks=0"
 # Install remaining dependencies.
 export SHELL=/bin/bash
 
-# Firefox might not be buildable on the latest Rust Nightly, so we should try
-# to use the same version that we use in our CI.
-RUST_NIGHTLY_VERSION=$(sed -n 's/^.*--channel.*\(nightly-[0-9-]*\).*$/\1/p' \
-  $SRC/mozilla-central/taskcluster/ci/toolchain/rust.yml
-)
-
-rustup toolchain install ${RUST_NIGHTLY_VERSION}
-rustup default ${RUST_NIGHTLY_VERSION}-x86_64-unknown-linux-gnu
+rustup default nightly
 
 ./mach --no-interactive bootstrap --application-choice browser
 
diff --git a/projects/firefox/mozconfig.coverage b/projects/firefox/mozconfig.coverage
index a99a37728..3e6101e0f 100644
--- a/projects/firefox/mozconfig.coverage
+++ b/projects/firefox/mozconfig.coverage
@@ -3,7 +3,6 @@ ac_add_options --disable-debug
 ac_add_options --disable-elf-hack
 ac_add_options --disable-jemalloc
 ac_add_options --disable-crashreporter
-ac_add_options --disable-av1
 ac_add_options --enable-fuzzing
 ac_add_options --enable-optimize=-O1
 ac_add_options --enable-debug-symbols=-gline-tables-only