Livemark
Livemark, commonly known as "Live Bookmark", was first introduced by Firefox. The term "Live Bookmark" has since been adopted by both Microsoft's Internet Explorer and Apple's Safari and is made up of a combination of an RSS feed and a special bookmark.
Using Firefox when a user navigates to a page that have placed a piece of HTML code into the
section of a page the user will see the icon at the end of the address bar. Clicking on this icon brings up Firefox's normal Bookmark dialog which allows the user to store the link as a bookmark.
In the Bookmarks menu the entry will the icon and an arrow next to it. A mouseover of the bookmark will present a secondary menu. The secondary menu is the links found in the RSS Feed. Firefox has essentially built into the bookmarks a mini Feed reader.
The Live Bookmark is not the clearest way to read the RSS Feed (especially if the feed is a Blog). Standard feed readers offer a more functionality (eg. displaying dates, descriptions, PREview panes etc.).