Brief is the perfect Firefox extension for those who use Live Bookmarks. It adds a feed reader interface to your browser (I keep it in a frozen tab). The good thing about it is that you don’t need to store anything online. For password-protected feeds (for example, to read Friends-Only feeds in LiveJournal), it’s the best solution.
It lets you view Unread items, you can “star” items, etc. Pretty much like a local Google Reader.