**VERY BASIC AND LIMITED** pwa workaround for firefox from script found on: https://www.reddit.com/r/linuxquestions/comments/omsgqd/alternative_to_nativefier/

firetron.sh

#!/bin/bash

## Usage: 
# ./firetron <name> <url>
# ./firetron hulu hulu.com

firefox -CreateProfile "$1"
cd "$HOME/.local/share/icons/hicolor/32x32/apps/" || exit
wget -O $1.png $2/favicon.ico
touch "$HOME/.local/share/applications/$1.desktop"
echo "[Desktop Entry]
Version=1.0
Type=Application
Exec=firefox -p $1 -url=$2
Name=$1
Icon=$HOME/.local/share/icons/hicolor/32x32/apps/$1.png
Categories=Network"  | sudo tee -a "$HOME/.local/share/applications/$1.desktop"
cd $HOME/.mozilla/firefox/"$(grep 'Path=' ~/.mozilla/firefox/profiles.ini | sed s/^Path=// | grep "$1")" || exit
touch user.js
echo 'user_pref("toolkit.legacyUserProfileCustomizations.stylesheets", true);'>> user.js
mkdir chrome
cd chrome || exit
touch userChrome.css
echo '
@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
#TabsToolbar {visibility: collapse;}
#navigator-toolbox {visibility: collapse;}
browser {margin-right: -14px; margin-bottom: -14px;}' >> userChrome.css