The Win Switch menu appears to offer the last choice in the .desktop file these typically appear to be the unity specific options which would normally be ignored / hidden in other environments. The files can of course be copied and modified which clears up the problem. It would of course be nice if the relevant parser could be adjusted to take the 1st option in the file (which is the default option AFAIK).

e.g.

Exert from the firefox.desktop file...

From the beginning of the file

[Desktop Entry]
Version=1.0
Name=Firefox Web Browser
....
Exec=firefox %u

The Win Switch menu shows the last option however....

From the end of the file

[Desktop Action NewPrivateWindow]
Name=Open a New Private Window
...
Exec=firefox -private-window
OnlyShowIn=Unity;

The gpg key at ​https://winswitch.org/gpg.asc used e.g. by the Debian / Ubuntu repos has expired:

$ curl -s  https://winswitch.org/gpg.asc  | gpg -

pub  1024D/F18AD6BB 2007-04-18 Antoine Martin <[email protected]>
uid                            [jpeg image of size 4992]
sub  2048g/6E23E963 2007-04-18 [expires: 2018-05-04]

leading to errors when one runs apt-get update:

Err:17 http://xpra.org xenial Release.gpg
  The following signatures were invalid: KEYEXPIRED 1525416977  KEYEXPIRED 1525416977  KEYEXPIRED 1525416977

Important:

• it needs a man page - this is a debian requirement: all public commands (ie: /usr/bin/) need a man page, even if it is a small one that refers to another one

More minor issues:

• how do you create your config files? this needs to be documented somewhere, maybe providing an example config with comments in /usr/share/winswitch/launcher-example/
• I've removed the default values from LauncherSession to ensure they are populated correctly from file - the code should ensure the values make sense (port>0, host.len>0)
• LauncherClient should show a warning if the session fails to start
• file mime-type mapping so users can double click on them and have the software automatically launched
• dealing with ssh-tunnels (totally non-trivial)