Using Ubuntu 19.10. I recently installed the kde plasma desktop as an option so I could log off and then log in to a user I created specifically to use the KDE Plasma desktop and applications. While in Ubuntu using Gnome as the default desktop all other browsers, Chrome, Brave, Opera etc use Nautilus to open the containing folder as they should since Nautilus is the default inode/directory setting and the default file manager for Gnome. Firefox however for reasons only known to God and hopefully you guys, has chosen to use Dolphin instead of Nautilus. I always have the option of just using a different browser as my default which I may wind up doing if you can't or won't fix your issue but I am hoping it is something simple I can do on my end. Any suggestions?