What are Live Bookmarks?
Live Bookmarks is a new technology in Firefox that lets you view RSS news and blog headlines in the bookmarks toolbar or bookmarks menu. With one glance, quickly see the latest headlines from your favourite sites. Go directly to the articles that interest you - saving you time.
A site is enabled for Live Bookmarks when you see this icon 
on the bottom right corner of the browser.
Clicking on the icon and selecting an RSS feed will bring up the Add Bookmark dialog. Select 'OK' and you will see Live Bookmarks with the rest of your bookmarks. Many people find it especially convenient to save Live Bookmarks in their Bookmarks Toolbar folder.
Live Bookmarks in Action
Many sites and blogs use RSS to publish their most recent headlines. The web site determines the number of headlines displayed and how often the headlines are updated.
Headlines from Slashdot (RSS) and the BBC News (RSS) displayed in the Bookmarks Sidebar. Clicking on a headline takes you right to the article.
Advanced Tips
- Add Live Bookmarks manually
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Some sites don't tell Firefox that they support Live Bookmarks, even though they actually do. If you know the URL of a site's RSS feed (url ends with .rdf or .xml), you can manually create a Live Bookmark for the site. Go to the Bookmarks menu and select 'Manage Bookmarks'. Under the 'File Menu', select 'New Live Bookmark'. Create a name for the Live Bookmark and add the URL. New articles from that site will appear as Live Bookmarks in Firefox.
- Share your bookmarks
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Why keep your bookmarks to yourself? Services like del.icio.us let you publish your own bookmarks as RSS feeds, so that other Firefox users can subscribe to your bookmarks through Live Bookmarks. Live Bookmarks and del.icio.us makes it easy to share cool sites you like with your friends.
You can also put your bookmarks into your own private RSS feed, to share your bookmarks among multiple computers.