Generally speaking, Firefox can send everything URL with a particular protocol to another application, such as mailto:, but there's no way to open one particular link in a different application.

If possible, I think it would be easiest for the user to add a favorite place to Windows Explorer for the FTP site and access it that way.

That is what I kind of figured. Thanks so much!

trying to edit top sites button in new tab. even though hovering shows this file///C:/Users/walter/Downloads, it is actually trying to go to http://file///C:/Users/walter/Downloads as seen in the address bar, above and when I try to re-edit the button in Top Sites, it shows as http://file///C:/Users?walter/Downloads, which of course, does NOT work. I am not sure if this is a limitation of how Top sites works. any ideas? Thanks, Walt

Hi Walt, could you start a new question on this? It seems to be a different issue (file:// instead of ftp://) and also this thread is already marked solved.

As you know, you can use the ASK A QUESTION link at the top of a page here, or try this link:

https://support.mozilla.org/questions/new/desktop

Scroll down past article suggestions to continue with the form.

Thank you, Jscher2000! I did as you suggested. sorry for the confusion