Nemo Keyboard Shortcut Problem with Firefox

[scotty65]

Are you sure that Firefox is using Nemo, and not the GTK file picker, for its file saving dialog? Maybe you need to check your preferences in Firefox.

This should help:

Browsers like Firefox require xdg-desktop-portal package to use OS default file manager

A known issue previously discussed on this forum is the issue where Firefox (and Chrome?) do not use the default file manager, for example to open folder after a download is completed. All suggestions in those 2 topics to update the mime files have no effect after Firefox or system has been restarted. There is a bug report in the Mozilla bugtracker that contains a solution, for which a package is required: xdg-desktop-portal this package is already installed in a default Manjaro (Gnome) install…

If Nemo is already your system’s default file manager, then there are probably only 2 settings in the above post that you might need to change:

2. Open about:config in Firefox v98 or higher.
3. Search for the following two settings and change both from 2 to 1:

widget.use-xdg-desktop-portal.file-picker
widget.widget.use-xdg-desktop-portal.mime-handler

3. Restart Firefox.
4. Test by downloading a file via Firefox and hit the button next to the download to open the folder. Notice it should open Nemo instead of Nautilus.

Note: I use Plasma, so I am unable to test your issue on my system.