Mint's WebApp-Manager on Debian

With Google dropping support for webapps next year and removing sync from Chromium it is time to come back to Firefox.
Trying to find out how to create webapps with Firefox I cam across Mint's WebApp-Manager.
https://itsfoss.com/web-app-manager-linux-mint/
https://github.com/linuxmint/webapp-manager

So first I tried just installing the deb package. Yes it installed but crashed.
So I figured what the heck let's see if I can backport the needed packages to Debian Stable.
As it has been almost 10 yrs since I have even touched a computer I wasn't sure if I could. Luckily the directions to build a "Simple Sid Backport" are pretty simple.
Here is what I did:
Code:How to Install Mint's WebApp-Manager on Raspberry Pi OS (Buster)

Step 1) sudo nano /etc/apt/sources.list add
deb-src http://deb.debian.org/debian/ sid main contrib non-free
deb https://deb.debian.org/debian/ buster-backports main contrib non-free
Step 2) wget http://ftp.us.debian.org/debian/pool/main/d/debian-archive-keyring/debian-archive-keyring_2019.1_all.deb
sudo dpkg -i debian-archive-keyring_2019.1_all.deb
sudo apt update && sudo apt install build-essential devhelp gdebi
sudo apt build-dep xapp
Step 3) sudo apt -b source xapp
Step 4) Install the packages
sudo gdebi libxapp1-dbgsym_2.0.7-1_armhf.deb
sudo gdebi libxapp-dev_2.0.7-1_armhf.deb
sudo gdebi gir1.2-xapp-1.0_2.0.7-1_armhf.deb
sudo gdebi libxapp1_2.0.7-1_armhf.deb
sudo gdebi xapps-common_2.0.7-1_all.deb
(If needed) sudo apt -f install
wget http://packages.linuxmint.com/pool/main/w/webapp-manager/webapp-manager_1.1.1_all.deb
sudo dpkg -i webapp-manager_1.1.1_all.debWhat it looks like:
https://imgur.com/PmeNVSY