Linux Mate Mint, Firefox Open Download Folder launches Nautilus

Where:  Firefox in Linux Mint Mate
Problem:  Nautilus is invloked instead of Caja
How:  Right clicking a downloaded file from the downloads dialog and selecting 'Open Containing Folder' Triggers it.

Solution:  in mate menu look for preferred application under preferences menu

If the drop down box is blank, reselect mate file manager.

These solutions below did not work or might of helped?  Source

in about:config
create two bolean strings and set both to TRUE
network.protocol-handler.expose.file
network.protocol-handler.external.file
Create a string and add 'caja' to this
network.protocol-handler.app.file

~/.local/share/applications/mimeapps.list
add line
inode/directory=caja-folder-handler.desktop;

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