each time I save a file with firefox and click on ‘display progress of ongoing downloads’ on the top right part of the browser and click to open the containing directory, debian opens the directory, but in a new tunar window, not in a new tab in a pre existing thunar window.
It’s tiring working with so many open windows. Better one window and several tabs.
Yes
https://docs.xfce.org/xfce/thunar/preferences#behavior_preferences
Tabs and Windows
Open new thunar instances as tabs
Whenever you launch thunar while an existing thunar window is already open, a new tab will be added to the existing thunar window instead of opening a new window.