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.
This is about Firefox not debian
Search on how to do this in Firefox, maybe in the about:config
Also note that Debian ships Firefox ESR which lacks behind on features, you might want to add mozillas official repo for the up to date browser
I would say it’s about thunar configuration or URL handler configs more than anything. The other comment has what looks like a good solution for x11, no idea if it works on Wayland though.
Firefox won’t be able to do this without Thunar supporting it, but someone else already posted that Thunar does support it.