$ /usr/bin/xpra start --dpi=96 --encoding=rgb ssh://<user>@<remotesrv> --env=LANG=da_DK --exit-with-children --start-child="firefox-esr"

(xpra:5123): Gtk-WARNING **: 12:08:31.006: Locale not supported by C library.
	Using the fallback 'C' locale.

(Xpra:5125): Gtk-WARNING **: 12:08:31.084: Locale not supported by C library.
	Using the fallback 'C' locale.
2022-10-09 12:08:31,117 Xpra GTK3 X11 client version 4.4-r0 64-bit
2022-10-09 12:08:31,198  running on Linux Debian 11 bullseye
2022-10-09 12:08:31,199  window manager is 'Openbox'

(Xpra-Audio-query:5145): Gtk-WARNING **: 12:08:32.367: Locale not supported by C library.
	Using the fallback 'C' locale.
2022-10-09 12:08:32,441 GStreamer loaded
2022-10-09 12:08:32,482 failed to instantiate the dbus notification handler:
2022-10-09 12:08:32,482  you may need to start a notification service for 'org.freedesktop.Notifications'
2022-10-09 12:08:32,482  disable notifications to avoid this warning
2022-10-09 12:08:32,485 created unix domain socket '/run/user/2000/xpra/clients/mydesktop-5123'
2022-10-09 12:08:33,546 No OpenGL_accelerate module loaded: No module named 'OpenGL_accelerate'
2022-10-09 12:08:33,818 Warning: vendor 'Intel' is greylisted,
2022-10-09 12:08:33,819  you may want to turn off OpenGL if you encounter bugs
2022-10-09 12:08:33,898 OpenGL enabled on 'Mesa Intel(R) HD Graphics 530 (SKL GT2)'
2022-10-09 12:08:33,932 Connected (version 2.0, client OpenSSH_8.4p1)
2022-10-09 12:08:34,160 Authentication (publickey) successful!
2022-10-09 12:08:34,319 ssh server OS is 'linux-gnu'
2022-10-09 12:08:34,583 Warning: appindicator library not found
2022-10-09 12:08:34,583  you may want to install libappindicator
2022-10-09 12:08:34,584  to enable the system tray.
2022-10-09 12:08:34,631  keyboard settings: rules=evdev, model=pc105, layout=dk
2022-10-09 12:08:34,634  desktop size is 5120x1440:
2022-10-09 12:08:34,634   :0.0 (1351x380 mm - DPI: 96x96)
2022-10-09 12:08:34,634     AUS DP-1         2560x1440 at    0x0    (598x336 mm - DPI: 109x109) workarea: 2560x1440
2022-10-09 12:08:34,634     AUS HDMI-2       2560x1440 at 2560x0    (598x336 mm - DPI: 109x109) workarea: 2560x1440 at 2560x0
2022-10-09 12:08:34,638  SSH: 'Entering daemon mode; any further errors will be reported to:'
2022-10-09 12:08:34,639  SSH: "  '/run/user/2000/xpra/S10980/server.log'"
2022-10-09 12:08:35,862  SSH: 'Actual display used: :1'
2022-10-09 12:08:35,863  SSH: "Actual log file name is now: '/run/user/2000/xpra/1/server.log'"
2022-10-09 12:08:43,685 enabled remote logging
2022-10-09 12:08:43,686 Xpra X11 seamless server version 4.4
2022-10-09 12:08:43,686  running on unknown
2022-10-09 12:08:43,733 running

(Xpra-Audio-play:5164): Gtk-WARNING **: 12:08:43.977: Locale not supported by C library.
	Using the fallback 'C' locale.
2022-10-09 12:08:44,024 audio playback using pulseaudio device:
2022-10-09 12:08:44,024 audio playback  'D10s Digital Stereo (IEC958)'
2022-10-09 12:08:44,567 audio playback using 'opus' audio codec
2022-10-09 12:09:20,581 server requested disconnect:
2022-10-09 12:09:20,582  server shutdown
2022-10-09 12:09:20,587 SSH EOF on stderr of run-xpra
2022-10-09 12:09:20,615 audio playback stopping
2022-10-09 12:09:20,615 removing unix domain socket '/run/user/2000/xpra/clients/mydesktop-5123'
/usr/lib/python3/dist-packages/gi/overrides/Gtk.py:1649: Warning: g_object_ref: assertion 'G_IS_OBJECT (object)' failed
  return _Gtk_main(*args, **kwargs)