Profile Sync Daemon config for Waterfox Flatpak

Create the file /usr/share/psd/browsers/waterfox-flatpak and add the following contents:

if ! flatpak override --user --show net.waterfox.waterfox | grep -q "/run/user/$UID/psd"; then
    flatpak override --user net.waterfox.waterfox --filesystem=/run/user/$UID/psd
fi

if [[ -d "$HOME"/.var/app/net.waterfox.waterfox/.waterfox ]]; then
    index=0
    PSNAME="$browser"
    while read -r profileItem; do
        if [[ $(echo "$profileItem" | cut -c1) = "/" ]]; then
            # path is not relative
            DIRArr[$index]="$profileItem"
        else
            # we need to append the default path to give a
            # fully qualified path
            DIRArr[$index]="$HOME/.var/app/net.waterfox.waterfox/.waterfox/$profileItem"
        fi
        (( index=index+1 ))
    done < <(grep '[Pp]'ath= "$HOME"/.var/app/net.waterfox.waterfox/.waterfox/profiles.ini | sed 's/[Pp]ath=//')
fi

check_suffix=1

Add Waterfox Flatpak to ~/.config/psd/psd.conf:

BROWSERS=(waterfox-flatpak)

Restart psd.service.

systemctl --user restart psd.service