I have applications that often have xml data in textareas. These xmls are always in a single line and are difficult to read. I created this addon to make the xmls in a readable format(pretty print). This works only for xmls in html textareas.
I managed to build my first simple addon for Firefox. It may not be built/written properly. It even does not work if there are spaces between tags. I picked up some script from internet to make it work.