Open in new tab instead of a new window

Ho can i make external software to open new tabs into the existing window instead of a new instance of Directory Opus?
Let's say i already have one instance of DO. then i'm on Firefox, downloads, and i click the icon to open the folder of the file i just downloaded.
That action should open a new tab and not a new window.

Turn on Preferences / Launching Opus / Explorer Replacement / Open external folders in a new tab.

See also: Always re-use a single window instead of opening new windows

i didn't see
ok thanks