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diff --git a/extensions/spellcheck/locales/en-US/hunspell/dictionary-sources/make-new-dict.sh b/extensions/spellcheck/locales/en-US/hunspell/dictionary-sources/make-new-dict.sh
new file mode 100755
index 0000000000..de06dfe3d6
--- /dev/null
+++ b/extensions/spellcheck/locales/en-US/hunspell/dictionary-sources/make-new-dict.sh
@@ -0,0 +1,128 @@
+#! /usr/bin/env sh
+
+# 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/.
+
+# This script creates a new dictionary by expanding the original,
+# Mozilla's, and the upstream dictionary to remove affix flags and
+# then doing the wordlist equivalent of diff3 to create a new
+# dictionary.
+#
+# The files 2-mozilla-add and 2-mozilla-rem contain words added and
+# removed, respectively in the Mozilla dictionary. The final
+# dictionary will be in hunspell-en_US-mozilla.zip.
+
+set -e
+
+export LANG=C
+export LC_ALL=C
+export LC_CTYPE=C
+export LC_COLLATE=C
+
+WKDIR="`pwd`"
+ORIG="$WKDIR/orig"
+SUPPORT_DIR="$WKDIR/support_files"
+SPELLER="$WKDIR/scowl/speller"
+
+# This is required by scowl scripts
+export SCOWL="$WKDIR/scowl/"
+
+expand() {
+ grep -v '^[0-9]\+$' | $SPELLER/munch-list expand $1 | sort -u
+}
+
+if [ ! -d "$SPELLER" ]; then
+ echo "The 'scowl' folder is missing. Check the documentation at"
+ echo "https://firefox-source-docs.mozilla.org/extensions/spellcheck/index.html"
+ exit 1
+fi
+
+mkdir -p $SUPPORT_DIR
+cd $SPELLER
+MK_LIST="../mk-list -v1 --accents=both en_US 60"
+cat <<EOF > params.txt
+With Input Command: $MK_LIST
+EOF
+# Note: the output of make-hunspell-dict is UTF-8
+$MK_LIST | ./make-hunspell-dict -one en_US-custom params.txt > ./make-hunspell-dict.log
+cd $WKDIR
+
+# Note: Input and output of "expand" is always ISO-8859-1.
+# All expanded word list files are thus in ISO-8859-1.
+expand $SPELLER/en.aff < $SPELLER/en.dic.supp > $SUPPORT_DIR/0-special.txt
+
+# Input is UTF-8, expand expects ISO-8859-1 so use iconv
+iconv -f utf-8 -t iso-8859-1 $ORIG/en_US-custom.dic | expand $ORIG/en_US-custom.aff > $SUPPORT_DIR/1-base.txt
+
+# Store suggestion exclusions (ending with !) defined in current Mozilla dictionary.
+# Save both the compressed (munched) and expanded version.
+grep '!$' ../en-US.dic > $SUPPORT_DIR/2-mozilla-nosug-munched.txt
+expand ../en-US.aff < $SUPPORT_DIR/2-mozilla-nosug-munched.txt > $SUPPORT_DIR/2-mozilla-nosug.txt
+
+# Remove suggestion exclusions and expand the existing Mozilla dictionary.
+# The existing Mozilla dictionary is already in ISO-8859-1.
+grep -v '!$' < ../en-US.dic > $SUPPORT_DIR/en-US-nosug.dic
+expand ../en-US.aff < $SUPPORT_DIR/en-US-nosug.dic > $SUPPORT_DIR/2-mozilla.txt
+rm $SUPPORT_DIR/en-US-nosug.dic
+
+# Input is UTF-8, expand expects ISO-8859-1 so use iconv
+iconv -f utf-8 -t iso-8859-1 $SPELLER/en_US-custom.dic | expand $SPELLER/en_US-custom.aff > $SUPPORT_DIR/3-upstream.txt
+
+# Suppress common lines and lines only in the 2nd file, leaving words that are
+# only available in the 1st file (SCOWL), i.e. were removed by Mozilla.
+comm -23 $SUPPORT_DIR/1-base.txt $SUPPORT_DIR/2-mozilla.txt > $SUPPORT_DIR/2-mozilla-removed.txt
+
+# Suppress common lines and lines only in the 1st file, leaving words that are
+# only available in the 2nd file (current Mozilla dictionary), i.e. were added
+# by Mozilla.
+comm -13 $SUPPORT_DIR/1-base.txt $SUPPORT_DIR/2-mozilla.txt > $SUPPORT_DIR/2-mozilla-added.txt
+
+# Suppress common lines and lines only in the 2nd file, leaving words that are
+# only available in the 1st file (words from the new upstream SCOWL dictionary).
+# The result is upstream, minus the words removed, plus the words added.
+comm -23 $SUPPORT_DIR/3-upstream.txt $SUPPORT_DIR/2-mozilla-removed.txt | cat - $SUPPORT_DIR/2-mozilla-added.txt | sort -u > $SUPPORT_DIR/4-patched.txt
+
+# Note: the output of make-hunspell-dict is UTF-8
+cat $SUPPORT_DIR/4-patched.txt | comm -23 - $SUPPORT_DIR/0-special.txt | $SPELLER/make-hunspell-dict -one en_US-mozilla /dev/null
+
+# Add back Mozilla suggestion exclusions. Need to convert the file from
+# ISO-8859-1 to UTF-8 first, then add back the line count and reorder.
+tail -n +2 en_US-mozilla.dic > en_US-mozilla-complete.dic
+iconv -f iso-8859-1 -t utf-8 $SUPPORT_DIR/2-mozilla-nosug-munched.txt >> en_US-mozilla-complete.dic
+wc -l < en_US-mozilla-complete.dic | tr -d '[:blank:]' > en_US-mozilla.dic
+LC_ALL=C sort en_US-mozilla-complete.dic >> en_US-mozilla.dic
+rm -f en_US-mozilla-complete.dic
+
+# Sanity check should yield identical results
+#comm -23 $SUPPORT_DIR/1-base.txt $SUPPORT_DIR/3-upstream.txt > $SUPPORT_DIR/3-upstream-remover.txt
+#comm -13 $SUPPORT_DIR/1-base.txt $SUPPORT_DIR/3-upstream.txt > $SUPPORT_DIR/3-upstream-added.txt
+#comm -23 $SUPPORT_DIR/2-mozilla.txt $SUPPORT_DIR/3-upstream-removed.txt | cat - $SUPPORT_DIR/3-upstream-added.txt | sort -u > $SUPPORT_DIR/4-patched-v2.txt
+
+expand ../en-US.aff < mozilla-specific.txt > 5-mozilla-specific.txt
+
+# Update Mozilla removed and added wordlists based on the new upstream
+# dictionary, save them as UTF-8 and not ISO-8951-1.
+# Ignore words excluded from suggestions for both files.
+comm -12 $SUPPORT_DIR/3-upstream.txt $SUPPORT_DIR/2-mozilla-removed.txt > $SUPPORT_DIR/5-mozilla-removed-tmp.txt
+comm -23 $SUPPORT_DIR/5-mozilla-removed-tmp.txt $SUPPORT_DIR/2-mozilla-nosug.txt > $SUPPORT_DIR/5-mozilla-removed.txt
+rm $SUPPORT_DIR/5-mozilla-removed-tmp.txt
+iconv -f iso-8859-1 -t utf-8 $SUPPORT_DIR/5-mozilla-removed.txt > 5-mozilla-removed.txt
+
+comm -13 $SUPPORT_DIR/3-upstream.txt $SUPPORT_DIR/2-mozilla-added.txt > $SUPPORT_DIR/5-mozilla-added-tmp.txt
+comm -23 $SUPPORT_DIR/5-mozilla-added-tmp.txt $SUPPORT_DIR/2-mozilla-nosug.txt > $SUPPORT_DIR/5-mozilla-added.txt
+rm $SUPPORT_DIR/5-mozilla-added-tmp.txt
+iconv -f iso-8859-1 -t utf-8 $SUPPORT_DIR/5-mozilla-added.txt > 5-mozilla-added.txt
+
+# Clean up some files
+rm hunspell-en_US-mozilla.zip
+rm nosug
+
+# Remove backup folders in preparation for the install-new-dict script
+FOLDERS=( "orig-bk" "mozilla-bk")
+for f in ${FOLDERS[@]}; do
+ if [ -d "$SUPPORT_DIR/$f" ]; then
+ echo "Removing backup folder $f"
+ rm -rf "$SUPPORT_DIR/$f"
+ fi
+done