It is parsing for me in Firefox just fine. Looks like WP Super Cache latest version of it is today 5-13. Maybe it was cached at a bad time? Or maybe your parser doesn’t like the HTML comments at the bottom from WP Super Cache.
Its not working for everything else like Opera Browser, Feedburner, chrome, and more. I am not sure how firefox is actually working, but everything else isnt. http://feeds.feedburner.com/Mobileblab that is the feedburner link…. not updated.