Systemd - Thunderbird - Start minimized without change of focus

Ask Fedora
, ,
1

I start thunderbird after login, using sytemd service unit file for user:

[Unit]
Description=Email Service

[Service]
TimeoutStartSec=0
ExecStartPre=sleep 300
Environment="LC_TIME=en_DK.UTF-8"
ExecStart=/mnt/Data/opt/bin/thunderbird
Restart=on-failure
RestartSec=10
SyslogIdentifier=EmailService

[Install]
WantedBy=default.target

Is it possible to start it minimized! I don’t want to change focus to the Thunderbird window when it starts. Note: --headless CLI option is not suitable for this purpose.