RSS feed from PortableApps.com doesn't reload automatically in PA Firefox 3.52

I like to keep my RSS feeds as pulldown lists on my Firefox bookmark toolbar just to keep track of sites casually. It's not an emergency if I miss anything so that's fine, but for some reason the PortableApps.com RSS feed does not update automatically. It only updates when I tell it to with a right-click Reload Live Bookmark.

Normally this might go into the Firefox forum except that every other feed works fine. Do others find they have problems with the PortableApps.com RSS feed specifically? Or is this something I really should put in the FF forum?

Thanks!