Thanks for you reply.

I am using version 3.9.7 build 1627. What happens now is I cancel the dialog panel from FDM and then accept the dialog panel from Firefox. I know it's only two clicks but it would be nice if I could just get them to open automatically in FF.

I've disabled bit torrent support but FDM still catches torrent links from Firefox. I want them to open directly in Vuze.

The option to ask, overwrite or rename when a file already exists.