Unique in way they open and scroll like regular items in the bookmarks menu just like Live Bookmarks did. Other rss reading add-ons I've seen/used open in the sidebar, page, or panel which requires more clicking and/or manual scrolling. I find the Livemarks way more efficient for feeds that have many items and are frequently updated. Includes option for refresh interval and ability to import/export feeds (or add them by entering feed url in Options dialog).

Issues:
* Settings dialog seems excessively slow to load.
* Would it be possible to add some way to distinguish between read/unread items? (Live Bookmarks did this and it's the only major missing feature; 5 stars with that ability added.)
* Is there any method to change the default folder to one located on the Bookmarks Toolbar instead of the Bookmarks Menu? (Edit: You can just drag the folder to the toolbar and it still seems to work fine.)

Update: Above issues no longer affect me with current version. Big 'Thank You!' for the read/unread feature.