9 files changed, 535 insertions, 0 deletions
diff --git a/taskcluster/docker/firefox-snap/Dockerfile b/taskcluster/docker/firefox-snap/Dockerfile
new file mode 100644
index 0000000000..5ab993b3b6
--- /dev/null
+++ b/taskcluster/docker/firefox-snap/Dockerfile
@@ -0,0 +1,64 @@
+## The below code is from snapcraft/docker/stable.Dockerfile
+## The modifications done are part of the documentation for enabling core18 snaps.
+## https://snapcraft.io/docs/t/creating-docker-images-for-snapcraft/11739
+
+FROM ubuntu:bionic
+
+ENV LANG='en_US.UTF-8' \
+    LANGUAGE='en_US:en' \
+    LC_ALL='en_US.UTF-8' \
+    PATH="/snap/bin:$PATH" \
+    SNAP='/snap/snapcraft/current' \
+    SNAP_NAME='snapcraft' \
+    SNAP_ARCH='amd64' \
+    TERM='dumb'
+
+# Grab dependencies. snapd is now required per https://github.com/snapcore/snapcraft/pull/3210
+RUN apt-get update && \
+    apt-get dist-upgrade --yes && \
+    apt-get install --yes \
+      curl \
+      jq \
+      squashfs-tools \
+      locales \
+      bzip2 \
+      curl \
+      gcc \
+      git \
+      python3 \
+      locales \
+      snapd \
+      sudo \
+      && \
+    apt-get clean && \
+locale-gen "$LANG"
+
+COPY download_and_install_snap.sh .
+
+# Grab the core snap (for backwards compatibility)
+RUN bash download_and_install_snap.sh 'core' 
+# Grab the core18 snap (which snapcraft uses as a base)
+RUN bash download_and_install_snap.sh 'core18'
+RUN bash download_and_install_snap.sh 'gnome-3-34-1804'
+RUN bash download_and_install_snap.sh 'gnome-3-34-1804-sdk'
+RUN bash download_and_install_snap.sh 'snapcraft'
+
+# Create a snapcraft runner (TODO: move version detection to the core of snapcraft).
+RUN mkdir -p /snap/bin
+RUN echo "#!/bin/sh" > /snap/bin/snapcraft
+RUN snap_version="$(awk '/^version:/{print $2}' /snap/snapcraft/current/meta/snap.yaml)" && echo "export SNAP_VERSION=\"$snap_version\"" >> /snap/bin/snapcraft
+RUN echo 'exec "$SNAP/usr/bin/python3" "$SNAP/bin/snapcraft" "$@"' >> /snap/bin/snapcraft
+RUN chmod +x /snap/bin/snapcraft
+
+RUN mkdir /scripts/
+WORKDIR /scripts/
+# Copy everything in the docker/firefox-snap folder but the Dockerfile
+#
+# XXX The following pattern is neither a regex nor a glob one. It's
+# documented at https://golang.org/pkg/path/filepath/#Match. There's no
+# way of explicitly filtering out "Dockerfile". If one day, someone needs
+# to add a file starting with "D", then we must revisit the pattern below.
+COPY [^D]* /scripts/
+
+# Set a default command useful for debugging
+CMD ["/bin/bash", "--login"]
diff --git a/taskcluster/docker/firefox-snap/Makefile b/taskcluster/docker/firefox-snap/Makefile
new file mode 100644
index 0000000000..d71dc70881
--- /dev/null
+++ b/taskcluster/docker/firefox-snap/Makefile
@@ -0,0 +1,12 @@
+DOCKERIO_USERNAME =$(error DOCKERIO_USERNAME should be set)
+IMAGE_NAME = firefox-snapcraft
+FULL_IMAGE_NAME = $(DOCKERIO_USERNAME)/$(IMAGE_NAME)
+
+build:
+	docker build -t $(FULL_IMAGE_NAME) --no-cache --rm .
+
+push:
+	docker push $(FULL_IMAGE_NAME):latest
+
+pull:
+	docker pull $(FULL_IMAGE_NAME):latest
diff --git a/taskcluster/docker/firefox-snap/download_and_install_snap.sh b/taskcluster/docker/firefox-snap/download_and_install_snap.sh
new file mode 100644
index 0000000000..7def88b2aa
--- /dev/null
+++ b/taskcluster/docker/firefox-snap/download_and_install_snap.sh
@@ -0,0 +1,27 @@
+#!/bin/bash
+
+set -ex
+
+SNAP_NAME="$1"
+SNAP_CHANNEL="${2:-stable}"
+SNAP_INSTALL_LOCATION="${3:-/snap}"
+
+SNAP_METADATA="$(curl --header 'X-Ubuntu-Series: 16' "https://api.snapcraft.io/api/v1/snaps/details/$SNAP_NAME?channel=$SNAP_CHANNEL")"
+
+set +x
+SNAP_SHA512="$(echo "$SNAP_METADATA" | jq '.download_sha512' -r)"
+SNAP_DOWNLOAD_URL="$(echo "$SNAP_METADATA" | jq '.download_url' -r)"
+SNAP_LAST_UPDATED="$(echo "$SNAP_METADATA" | jq '.last_updated' -r)"
+SNAP_REVISION="$(echo "$SNAP_METADATA" | jq '.revision' -r)"
+SNAP_VERSION="$(echo "$SNAP_METADATA" | jq '.version' -r)"
+set -x
+
+echo "Downloading $SNAP_NAME, version $SNAP_VERSION, revision $SNAP_REVISION (last updated: $SNAP_LAST_UPDATED)..."
+curl --location "$SNAP_DOWNLOAD_URL" --output "$SNAP_NAME.snap"
+sha512sum -c <(echo "$SNAP_SHA512  $SNAP_NAME.snap") 
+
+mkdir -p "$SNAP_INSTALL_LOCATION/$SNAP_NAME"
+unsquashfs -d "$SNAP_INSTALL_LOCATION/$SNAP_NAME/current" "$SNAP_NAME.snap"
+rm "$SNAP_NAME.snap"
+
+echo "$SNAP_NAME version $SNAP_VERSION has correctly been uploaded and installed."
+\ No newline at end of file
diff --git a/taskcluster/docker/firefox-snap/extract_locales_from_l10n_json.py b/taskcluster/docker/firefox-snap/extract_locales_from_l10n_json.py
new file mode 100644
index 0000000000..50da17a859
--- /dev/null
+++ b/taskcluster/docker/firefox-snap/extract_locales_from_l10n_json.py
@@ -0,0 +1,17 @@
+#!/usr/bin/env python3
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+from __future__ import absolute_import, print_function
+
+import sys
+import json
+
+l10n_changesets_json_path = sys.argv[1]
+with open(l10n_changesets_json_path) as f:
+    locales = json.load(f).keys()
+linux_locales = [l for l in locales if l != "ja-JP-mac"]
+
+print("\n".join(sorted(linux_locales)))
diff --git a/taskcluster/docker/firefox-snap/firefox.desktop b/taskcluster/docker/firefox-snap/firefox.desktop
new file mode 100644
index 0000000000..73e36e8d83
--- /dev/null
+++ b/taskcluster/docker/firefox-snap/firefox.desktop
@@ -0,0 +1,219 @@
+[Desktop Entry]
+Version=1.0
+Name=Firefox Web Browser
+Name[ar]=متصفح الويب فَيَرفُكْس
+Name[ast]=Restolador web Firefox
+Name[bn]=ফায়ারফক্স ওয়েব ব্রাউজার
+Name[ca]=Navegador web Firefox
+Name[cs]=Firefox Webový prohlížeč
+Name[da]=Firefox - internetbrowser
+Name[el]=Περιηγητής Firefox
+Name[es]=Navegador web Firefox
+Name[et]=Firefoxi veebibrauser
+Name[fa]=مرورگر اینترنتی Firefox
+Name[fi]=Firefox-selain
+Name[fr]=Navigateur Web Firefox
+Name[gl]=Navegador web Firefox
+Name[he]=דפדפן האינטרנט Firefox
+Name[hr]=Firefox web preglednik
+Name[hu]=Firefox webböngésző
+Name[it]=Firefox Browser Web
+Name[ja]=Firefox ウェブ・ブラウザ
+Name[ko]=Firefox 웹 브라우저
+Name[ku]=Geroka torê Firefox
+Name[lt]=Firefox interneto naršyklė
+Name[nb]=Firefox Nettleser
+Name[nl]=Firefox webbrowser
+Name[nn]=Firefox Nettlesar
+Name[no]=Firefox Nettleser
+Name[pl]=Przeglądarka WWW Firefox
+Name[pt]=Firefox Navegador Web
+Name[pt_BR]=Navegador Web Firefox
+Name[ro]=Firefox – Navigator Internet
+Name[ru]=Веб-браузер Firefox
+Name[sk]=Firefox - internetový prehliadač
+Name[sl]=Firefox spletni brskalnik
+Name[sv]=Firefox webbläsare
+Name[tr]=Firefox Web Tarayıcısı
+Name[ug]=Firefox توركۆرگۈ
+Name[uk]=Веб-браузер Firefox
+Name[vi]=Trình duyệt web Firefox
+Name[zh_CN]=Firefox 网络浏览器
+Name[zh_TW]=Firefox 網路瀏覽器
+Comment=Browse the World Wide Web
+Comment[ar]=تصفح الشبكة العنكبوتية العالمية
+Comment[ast]=Restola pela Rede
+Comment[bn]=ইন্টারনেট ব্রাউজ করুন
+Comment[ca]=Navegueu per la web
+Comment[cs]=Prohlížení stránek World Wide Webu
+Comment[da]=Surf på internettet
+Comment[de]=Im Internet surfen
+Comment[el]=Μπορείτε να περιηγηθείτε στο διαδίκτυο (Web)
+Comment[es]=Navegue por la web
+Comment[et]=Lehitse veebi
+Comment[fa]=صفحات شبکه جهانی اینترنت را مرور نمایید
+Comment[fi]=Selaa Internetin WWW-sivuja
+Comment[fr]=Naviguer sur le Web
+Comment[gl]=Navegar pola rede
+Comment[he]=גלישה ברחבי האינטרנט
+Comment[hr]=Pretražite web
+Comment[hu]=A világháló böngészése
+Comment[it]=Esplora il web
+Comment[ja]=ウェブを閲覧します
+Comment[ko]=웹을 돌아 다닙니다
+Comment[ku]=Li torê bigere
+Comment[lt]=Naršykite internete
+Comment[nb]=Surf på nettet
+Comment[nl]=Verken het internet
+Comment[nn]=Surf på nettet
+Comment[no]=Surf på nettet
+Comment[pl]=Przeglądanie stron WWW
+Comment[pt]=Navegue na Internet
+Comment[pt_BR]=Navegue na Internet
+Comment[ro]=Navigați pe Internet
+Comment[ru]=Доступ в Интернет
+Comment[sk]=Prehliadanie internetu
+Comment[sl]=Brskajte po spletu
+Comment[sv]=Surfa på webben
+Comment[tr]=İnternet'te Gezinin
+Comment[ug]=دۇنيادىكى توربەتلەرنى كۆرگىلى بولىدۇ
+Comment[uk]=Перегляд сторінок Інтернету
+Comment[vi]=Để duyệt các trang web
+Comment[zh_CN]=浏览互联网
+Comment[zh_TW]=瀏覽網際網路
+GenericName=Web Browser
+GenericName[ar]=متصفح ويب
+GenericName[ast]=Restolador Web
+GenericName[bn]=ওয়েব ব্রাউজার
+GenericName[ca]=Navegador web
+GenericName[cs]=Webový prohlížeč
+GenericName[da]=Webbrowser
+GenericName[el]=Περιηγητής διαδικτύου
+GenericName[es]=Navegador web
+GenericName[et]=Veebibrauser
+GenericName[fa]=مرورگر اینترنتی
+GenericName[fi]=WWW-selain
+GenericName[fr]=Navigateur Web
+GenericName[gl]=Navegador Web
+GenericName[he]=דפדפן אינטרנט
+GenericName[hr]=Web preglednik
+GenericName[hu]=Webböngésző
+GenericName[it]=Browser web
+GenericName[ja]=ウェブ・ブラウザ
+GenericName[ko]=웹 브라우저
+GenericName[ku]=Geroka torê
+GenericName[lt]=Interneto naršyklė
+GenericName[nb]=Nettleser
+GenericName[nl]=Webbrowser
+GenericName[nn]=Nettlesar
+GenericName[no]=Nettleser
+GenericName[pl]=Przeglądarka WWW
+GenericName[pt]=Navegador Web
+GenericName[pt_BR]=Navegador Web
+GenericName[ro]=Navigator Internet
+GenericName[ru]=Веб-браузер
+GenericName[sk]=Internetový prehliadač
+GenericName[sl]=Spletni brskalnik
+GenericName[sv]=Webbläsare
+GenericName[tr]=Web Tarayıcı
+GenericName[ug]=توركۆرگۈ
+GenericName[uk]=Веб-браузер
+GenericName[vi]=Trình duyệt Web
+GenericName[zh_CN]=网络浏览器
+GenericName[zh_TW]=網路瀏覽器
+Keywords=Internet;WWW;Browser;Web;Explorer
+Keywords[ar]=انترنت;إنترنت;متصفح;ويب;وب
+Keywords[ast]=Internet;WWW;Restolador;Web;Esplorador
+Keywords[ca]=Internet;WWW;Navegador;Web;Explorador;Explorer
+Keywords[cs]=Internet;WWW;Prohlížeč;Web;Explorer
+Keywords[da]=Internet;Internettet;WWW;Browser;Browse;Web;Surf;Nettet
+Keywords[de]=Internet;WWW;Browser;Web;Explorer;Webseite;Site;surfen;online;browsen
+Keywords[el]=Internet;WWW;Browser;Web;Explorer;Διαδίκτυο;Περιηγητής;Firefox;Φιρεφοχ;Ιντερνετ
+Keywords[es]=Explorador;Internet;WWW
+Keywords[fi]=Internet;WWW;Browser;Web;Explorer;selain;Internet-selain;internetselain;verkkoselain;netti;surffaa
+Keywords[fr]=Internet;WWW;Browser;Web;Explorer;Fureteur;Surfer;Navigateur
+Keywords[he]=דפדפן;אינטרנט;רשת;אתרים;אתר;פיירפוקס;מוזילה;
+Keywords[hr]=Internet;WWW;preglednik;Web
+Keywords[hu]=Internet;WWW;Böngésző;Web;Háló;Net;Explorer
+Keywords[it]=Internet;WWW;Browser;Web;Navigatore
+Keywords[is]=Internet;WWW;Vafri;Vefur;Netvafri;Flakk
+Keywords[ja]=Internet;WWW;Web;インターネット;ブラウザ;ウェブ;エクスプローラ
+Keywords[nb]=Internett;WWW;Nettleser;Explorer;Web;Browser;Nettside
+Keywords[nl]=Internet;WWW;Browser;Web;Explorer;Verkenner;Website;Surfen;Online
+Keywords[pt]=Internet;WWW;Browser;Web;Explorador;Navegador
+Keywords[pt_BR]=Internet;WWW;Browser;Web;Explorador;Navegador
+Keywords[ru]=Internet;WWW;Browser;Web;Explorer;интернет;браузер;веб;файрфокс;огнелис
+Keywords[sk]=Internet;WWW;Prehliadač;Web;Explorer
+Keywords[sl]=Internet;WWW;Browser;Web;Explorer;Brskalnik;Splet
+Keywords[tr]=İnternet;WWW;Tarayıcı;Web;Gezgin;Web sitesi;Site;sörf;çevrimiçi;tara
+Keywords[uk]=Internet;WWW;Browser;Web;Explorer;Інтернет;мережа;переглядач;оглядач;браузер;веб;файрфокс;вогнелис;перегляд
+Keywords[vi]=Internet;WWW;Browser;Web;Explorer;Trình duyệt;Trang web
+Keywords[zh_CN]=Internet;WWW;Browser;Web;Explorer;网页;浏览;上网;火狐;Firefox;ff;互联网;网站;
+Keywords[zh_TW]=Internet;WWW;Browser;Web;Explorer;網際網路;網路;瀏覽器;上網;網頁;火狐
+Exec=firefox %u
+Terminal=false
+X-MultipleArgs=false
+Type=Application
+Icon=/browser/chrome/icons/default/default128.png
+Categories=GNOME;GTK;Network;WebBrowser;
+MimeType=text/html;text/xml;application/xhtml+xml;application/xml;application/rss+xml;application/rdf+xml;image/gif;image/jpeg;image/png;x-scheme-handler/http;x-scheme-handler/https;x-scheme-handler/ftp;x-scheme-handler/chrome;video/webm;application/x-xpinstall;
+StartupNotify=true
+Actions=NewWindow;NewPrivateWindow;
+
+[Desktop Action NewWindow]
+Name=Open a New Window
+Name[ar]=افتح نافذة جديدة
+Name[ast]=Abrir una ventana nueva
+Name[bn]=Abrir una ventana nueva
+Name[ca]=Obre una finestra nova
+Name[cs]=Otevřít nové okno
+Name[da]=Åbn et nyt vindue
+Name[de]=Ein neues Fenster öffnen
+Name[el]=Άνοιγμα νέου παραθύρου
+Name[es]=Abrir una ventana nueva
+Name[fi]=Avaa uusi ikkuna
+Name[fr]=Ouvrir une nouvelle fenêtre
+Name[gl]=Abrir unha nova xanela
+Name[he]=פתיחת חלון חדש
+Name[hr]=Otvori novi prozor
+Name[hu]=Új ablak nyitása
+Name[it]=Apri una nuova finestra
+Name[ja]=新しいウィンドウを開く
+Name[ko]=새 창 열기
+Name[ku]=Paceyeke nû veke
+Name[lt]=Atverti naują langą
+Name[nb]=Åpne et nytt vindu
+Name[nl]=Nieuw venster openen
+Name[pt]=Abrir nova janela
+Name[pt_BR]=Abrir nova janela
+Name[ro]=Deschide o fereastră nouă
+Name[ru]=Новое окно
+Name[sk]=Otvoriť nové okno
+Name[sl]=Odpri novo okno
+Name[sv]=Öppna ett nytt fönster
+Name[tr]=Yeni pencere aç
+Name[ug]=يېڭى كۆزنەك ئېچىش
+Name[uk]=Відкрити нове вікно
+Name[vi]=Mở cửa sổ mới
+Name[zh_CN]=新建窗口
+Name[zh_TW]=開啟新視窗
+Exec=firefox -new-window
+
+[Desktop Action NewPrivateWindow]
+Name=Open a New Private Window
+Name[ar]=افتح نافذة جديدة للتصفح الخاص
+Name[ca]=Obre una finestra nova en mode d'incògnit
+Name[de]=Ein neues privates Fenster öffnen
+Name[es]=Abrir una ventana privada nueva
+Name[fi]=Avaa uusi yksityinen ikkuna
+Name[fr]=Ouvrir une nouvelle fenêtre de navigation privée
+Name[he]=פתיחת חלון גלישה פרטית חדש
+Name[hu]=Új privát ablak nyitása
+Name[it]=Apri una nuova finestra anonima
+Name[nb]=Åpne et nytt privat vindu
+Name[ru]=Новое приватное окно
+Name[sl]=Odpri novo okno zasebnega brskanja
+Name[tr]=Yeni bir pencere aç
+Name[uk]=Відкрити нове вікно у потайливому режимі
+Name[zh_TW]=開啟新隱私瀏覽視窗
+Exec=firefox -private-window
diff --git a/taskcluster/docker/firefox-snap/firefox.snapcraft.yaml.in b/taskcluster/docker/firefox-snap/firefox.snapcraft.yaml.in
new file mode 100644
index 0000000000..5ed18ef519
--- /dev/null
+++ b/taskcluster/docker/firefox-snap/firefox.snapcraft.yaml.in
@@ -0,0 +1,82 @@
+name: firefox
+version: @VERSION@-@BUILD_NUMBER@
+summary: Mozilla Firefox web browser
+description:  Firefox is a powerful, extensible web browser with support for modern web application technologies.
+confinement: strict
+grade: stable
+base: core18
+
+apps:
+  firefox:
+    command: firefox
+    command-chain: [tmpdir]
+    desktop: distribution/firefox.desktop
+    extensions: [gnome-3-34]
+    environment:
+      DISABLE_WAYLAND: 1
+      HOME: "$SNAP_USER_COMMON"
+      GTK_USE_PORTAL: 1
+    slots:
+      - dbus-daemon
+      - mpris
+    plugs:
+      - avahi-observe
+      - browser-sandbox
+      - camera
+      - cups-control
+      - gsettings
+      - home
+      - joystick
+      - network
+      - network-observe
+      - opengl
+      - pulseaudio
+      - removable-media
+      - screen-inhibit-control
+      - u2f-devices
+      - unity7
+      - upower-observe
+
+plugs:
+  browser-sandbox:
+    interface: browser-support
+    allow-sandbox: true
+
+parts:
+  firefox:
+    plugin: dump
+    source: source
+    stage-packages:
+      - libxt6
+      - libdbus-glib-1-2
+      - libasound2
+      - libpulse0
+      - libgl1-mesa-dri
+      - libgl1-mesa-glx
+      - libmirclient9
+      - desktop-file-utils
+      - ffmpeg
+      - libc-bin
+      - locales-all
+      - libcurl3-gnutls
+    prime:
+      - -usr/lib/*/libharfbuzz*
+      - -usr/lib/*/*pango*
+
+  # Find files provided by the base and platform snap and ensure they aren't
+  # duplicated in this snap
+  cleanup:
+    after: [firefox]
+    plugin: nil
+    build-snaps: [core18, gnome-3-34-1804]
+    override-prime: |
+      set -eux
+      for snap in "core18" "gnome-3-34-1804"; do
+        cd "/snap/$snap/current" && find . -type f,l -exec rm -f "$SNAPCRAFT_PRIME/{}" \;
+      done
+
+slots:
+  dbus-daemon:
+    interface: dbus
+    bus: session
+    name: org.mozilla.firefox
diff --git a/taskcluster/docker/firefox-snap/policies.json b/taskcluster/docker/firefox-snap/policies.json
new file mode 100644
index 0000000000..f36622021f
--- /dev/null
+++ b/taskcluster/docker/firefox-snap/policies.json
@@ -0,0 +1,5 @@
+{
+  "policies": {
+    "DisableAppUpdate": true
+  }
+}
diff --git a/taskcluster/docker/firefox-snap/runme.sh b/taskcluster/docker/firefox-snap/runme.sh
new file mode 100755
index 0000000000..c5a98fb7e0
--- /dev/null
+++ b/taskcluster/docker/firefox-snap/runme.sh
@@ -0,0 +1,103 @@
+#!/bin/bash
+
+set -xe
+
+# Thunderbird Snap builds will set this to "thunderbird"
+: PRODUCT                       "${PRODUCT:=firefox}"
+
+# Required env variables
+test "$VERSION"
+test "$BUILD_NUMBER"
+test "$CANDIDATES_DIR"
+test "$L10N_CHANGESETS"
+
+# Optional env variables
+: WORKSPACE                     "${WORKSPACE:=/home/worker/workspace}"
+: ARTIFACTS_DIR                 "${ARTIFACTS_DIR:=/home/worker/artifacts}"
+: PUSH_TO_CHANNEL               ""
+
+SCRIPT_DIRECTORY="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
+TARGET="target.snap"
+TARGET_FULL_PATH="$ARTIFACTS_DIR/$TARGET"
+SOURCE_DEST="${WORKSPACE}/source"
+
+mkdir -p "$ARTIFACTS_DIR"
+rm -rf "$SOURCE_DEST" && mkdir -p "$SOURCE_DEST"
+
+CURL="curl --location --retry 10 --retry-delay 10"
+
+# Download and extract en-US linux64 binary
+$CURL -o "${WORKSPACE}/${PRODUCT}.tar.bz2" \
+    "${CANDIDATES_DIR}/${VERSION}-candidates/build${BUILD_NUMBER}/linux-x86_64/en-US/${PRODUCT}-${VERSION}.tar.bz2"
+tar -C "$SOURCE_DEST" -xf "${WORKSPACE}/${PRODUCT}.tar.bz2" --strip-components=1
+
+DISTRIBUTION_DIR="$SOURCE_DEST/distribution"
+if [[ "$PRODUCT" == "firefox" ]]; then
+    # Get Ubuntu configuration
+    PARTNER_CONFIG_DIR="$WORKSPACE/partner_config"
+    git clone https://github.com/mozilla-partners/canonical.git "$PARTNER_CONFIG_DIR"
+    mv "$PARTNER_CONFIG_DIR/desktop/ubuntu/distribution" "$DISTRIBUTION_DIR"
+else
+    mkdir -p "$DISTRIBUTION_DIR"
+fi
+
+cp -v "$SCRIPT_DIRECTORY/${PRODUCT}.desktop" "$DISTRIBUTION_DIR"
+
+# Add a group policy file to disable app updates, as those are handled by snapd
+cp -v "$SCRIPT_DIRECTORY/policies.json" "$DISTRIBUTION_DIR"
+
+# Use list of locales to fetch L10N XPIs
+$CURL -o "${WORKSPACE}/l10n_changesets.json" "$L10N_CHANGESETS"
+locales=$(python3 "$SCRIPT_DIRECTORY/extract_locales_from_l10n_json.py" "${WORKSPACE}/l10n_changesets.json")
+
+mkdir -p "$DISTRIBUTION_DIR/extensions"
+for locale in $locales; do
+    $CURL -o "$SOURCE_DEST/distribution/extensions/langpack-${locale}@${PRODUCT}.mozilla.org.xpi" \
+        "$CANDIDATES_DIR/${VERSION}-candidates/build${BUILD_NUMBER}/linux-x86_64/xpi/${locale}.xpi"
+done
+
+# Extract gtk30.mo from Ubuntu language packs
+apt download language-pack-gnome-*-base
+for i in *.deb; do
+    # shellcheck disable=SC2086
+    dpkg-deb --fsys-tarfile $i | tar xv -C "$SOURCE_DEST" --wildcards "./usr/share/locale-langpack/*/LC_MESSAGES/gtk30.mo" || true
+done
+
+# Add wrapper script to set TMPDIR appropriate for the snap
+cp -v "$SCRIPT_DIRECTORY/tmpdir" "$SOURCE_DEST"
+
+# Generate snapcraft manifest
+sed -e "s/@VERSION@/${VERSION}/g" -e "s/@BUILD_NUMBER@/${BUILD_NUMBER}/g" ${PRODUCT}.snapcraft.yaml.in > "${WORKSPACE}/snapcraft.yaml"
+cd "${WORKSPACE}"
+
+# Make sure snapcraft knows we're building amd64, even though we may not be on this arch.
+export SNAP_ARCH='amd64'
+
+# When a snap is built, snapcraft fetches deb packages from ubuntu.com. They may bump packages
+# there and remove the old ones. Updating the database allows snapcraft to find the latest packages.
+# For more context, see 1448239
+apt-get update
+
+snapcraft
+
+mv -- *.snap "$TARGET_FULL_PATH"
+
+cd "$ARTIFACTS_DIR"
+
+# Generate checksums file
+size=$(stat --printf="%s" "$TARGET_FULL_PATH")
+sha=$(sha512sum "$TARGET_FULL_PATH" | awk '{print $1}')
+echo "$sha sha512 $size $TARGET" > "$TARGET.checksums"
+
+echo "Generating signing manifest"
+hash=$(sha512sum "$TARGET.checksums" | awk '{print $1}')
+
+cat << EOF > signing_manifest.json
+[{"file_to_sign": "$TARGET.checksums", "hash": "$hash"}]
+EOF
+
+# For posterity
+find . -ls
+cat "$TARGET.checksums"
+cat signing_manifest.json
diff --git a/taskcluster/docker/firefox-snap/tmpdir b/taskcluster/docker/firefox-snap/tmpdir
new file mode 100755
index 0000000000..e7e60801fa
--- /dev/null
+++ b/taskcluster/docker/firefox-snap/tmpdir
@@ -0,0 +1,6 @@
+#!/bin/bash
+
+# Set TMPDIR to be under the user's default Downloads dir
+export TMPDIR=$(xdg-user-dir DOWNLOAD)/firefox.tmp
+
+exec "$@"