Use the system Firefox ESR installation as the Firefox runtime for firefoxpwa.
 .
 This package installs a systemd user unit that will configure the firefox-esr
 installation for use with firefoxpwa.  The firefox-esr installation is mounted
 into the runtime location with fuse-overlayfs, then patched with firefoxpwa.
 .
 Enable the service for your user with:
 systemctl --user enable --now firefoxesr-pwa-runtime.service
            Installed Size: 18.4 kB
            
            Architectures:  all