Question : How do I make Firefox prompt me for an application to open XML files?

When I click a link that points to an XML file, I will sometimes want to be able to perform processing on the XML file using my own code, but I don't want to have to save the file locally and pass its file path to my application using Windows Explorer.  I'd rather have Firefox let me choose an application, or to view the XML file in Firefox.

Answer : How do I make Firefox prompt me for an application to open XML files?

> It only lets me open the page or the source with IE or Notepad or Wordpad.

Launchy auto-senses some applications, but you can add many more via the options menu for Launchy that you get to via the Add-ons window (which you get to via Firefox's Tools menu). (Many extensions offer options menus the same way.)