Sometimes you really want to open another instance of Filezilla on OSX. This because you do not want to wait for one website to be done uploading or downloading something. You want to let the upload run its course on site a while you edit a file one site b. Well you are in luck.
Multiple Instances on OSX
You can open another instance of Filezilla on OSX using the terminal. Just fire up a terminal and run this command to open another instance of an application like Filezilla:
open -n -a "APPLICATION NAME"
Another Filezilla Instance
So if you want to open another FileZilla window you run:
open -n -a "Filezilla"