Sage is a lightweight RSS and Atom feed aggregator extension for Mozilla Firefox. It's got a lot of what you need and not much of what you don't. Reads RSS (2.0, 1.0, 0.9x) and Atom feedsFeed DiscoveryIntegrates with Firefox's bookmark systemImports and exports OPML feed listsNewspaper feed rendering customizable via style sheetsSupport for the following locales: Argentine Spanish, Catalan, Chines