I've got to mention the FF add-on "InfoRSS" which I haven't used in a while, but I just exported my feeds to it rather painlessly and it offers some nice featur

I've got to mention the FF add-on "InfoRSS" which I haven't used in a while, but I just exported my feeds to it rather painlessly and it offers some nice features if you're willing to put a bit of time into customizing what you want from it. Deals with podcasts as well.