Is this with all type files?

I've called the big guys to help you. Good luck.

I want to change the program that opens up when I clink "Open Containing Folder" after I have downloaded something. I have tried everything that I could find.

Is the program name kept in about:config?

That isn't a setting in Firefox, but is set on the OS level (Linux).

• http://superuser.com/questions/465495/how-to-find-the-default-file-manager
• xdg-mime query default inode/directory

I get:

• /usr/share/applications/nautilus-folder-handler.desktop

[Desktop Entry]
Name=Open Folder
TryExec=nautilus
Exec=nautilus --no-desktop %U
NoDisplay=true
Terminal=false
Icon=folder-open
StartupNotify=true
Type=Application
MimeType=x-directory/gnome-default-handler;x-directory/normal;inode/directory;application/x-gnome-saved-search;
OnlyShowIn=GNOME;

• https://www.google.com/search?q=default+linux+file+manager

It does not look like Firefox is honoring the xdg-mine value.

[vince@Vincepc ~]$ xdg-mime query default inode/directory dolphin.desktop

xdg-open /etc opens the /etc directory in Dolphin like I want. However, in Firefox if I try to open the containing folder of a downloaded file, it opens in a program called Files. Where does Files come from? I do not have a program with that name installed according to YUMEX.

How do I find out where Firefox is getting the name of the program to use?

Did you search the .desktop files to see if there is one with that Files item?

• /usr/share/applications/
• ~/.local/share/applications

I have the same problem with Debian 8.

I used the Gnome System Monitor and found that 'Files' is actually /usr/bin/nautilus the Gnome file manager.

I renamed nautilus to stop it running. Firefox launched /usr/bin/pcmanfm, the LXDE file manager, instead.

I then renamed pcmanfm and Firefox then launched konqueror.

In fact, it now launches the default KDE program for handling directories which can easily be edited. In either konqueror or dolphin right-click on a directory, select 'properties', and then 'File Type Options'. You can move whatever you want to the top of the list.

So I solved the problem for my system - though it is a bit of a Kludge and I am still not sure what Firefox is doing.