hello ruthmessing, this is just a special type of bookmark making use of rss feeds - you can add the rss feed that any site of your choosing is providing to the bookmarks as well: Live Bookmarks - Subscribe to a web page for news and updates

Apparently too complicated for me. i can't find a "feed" icon on NBC news, CNN or any other headline news. There is no "feed" icon on my Mozilla website that I can find.

hello, you'll find the rss feed from nbc news at http://feeds.nbcnews.com/feeds/topstories

cnn has a whole directory of available feeds: http://edition.cnn.com/services/rss/