Wizz RSS Feed and News Reader is a great freeware plugin/addon for Mozilla Firefox that makes subscribing to and reading RSS feeds a breeze.
The Wizz RSS Reader is fully integrated into Firefox and installs an easy to use toolbar to access all of its features which include supporting all versions of RSS feeds, GZIP compressed feeds, Atom 0.3 and 1.0 feeds, OPML import and export and integrated Feedster and Feedbase searching. One of the best features I have found form using the reader is it’s ability to save your feeds to the Wizz servers, and then you can download them into all of the other computer you use. A great piece of software at an incredible price (free!)