crx.sh

#!/bin/env zsh

mkdir -p chrome-crx
id=$1
downloadUrl="https://clients2.google.com/service/update2/crx?response=redirect&prodversion=56.0&x=id%3D$id%26installsource%3Dondemand%26lang%3Den-US%26uc"

if [ ! -f "chrome-crx/$id.crx" ]; then
        http --download --output "chrome-crx/$id.crx" "$downloadUrl"
fi

echo "To unpack create folder first. Go into folder and do: 7z x ../chrome-crx/$id.crx"

• id is the id of Chrome extension something like (bmnlcjabgnpnenekpadlanbbkooimhnj) - it's right there in browser address bar
• I am using httpie (you can replace with wget or curl)
• You need 7z to unpack