This is a simple application that will allow you to open XML files in Firefox. You need two things to use this: a file browser (Astro, for example) and Firefox. Browse to any XML file with your file browser, open it, and select &XMLViewer; for Firefox& from the list of options presented. If you don't already have Firefox installed, you'll be prompted to download it and be taken to the market page. Firefox has a good XML viewer built in. This does nothing but pass through an &open; XML file& request to it. That's it.