100% Free RSS/Atom Feed Reader and Podcatcher for Firefox

Wizz RSS News Reader for Firefox can be installed here.

Also see the Free Feed Publication for your Blog or Website lens.

Features: -
# Supports all versions of RSS.
# Supports Atom 0.3 and 1.0.
# Supports Podcast (Enclosure) feeds.
# Supports Feed protocol.
# Supports integration with Firefox 2.0 feed handling (Please see release notes for details on how to integrate - http://www.wizzrss.com/ReleaseNotes.php#a213).
# Supports GZIP compression (i.e. Feeds that are gzipped).
# Filter news items on words and/or phrases.
# Feed Search - Finds feeds/OPML identified with correct mime types.
# Quick Read function to test/preview feeds before adding them.
# Integrated Watch List for monitoring selected feeds (Monitoring interval is configurable).
# Watch List can be configured, per watched feed, to notify or to save new items.
# Supports OPML import and export (Import OPML from local file or from remote host).
# Optionally hide read items.
# Optional server storage of feeds for easy access from any PC.
# Publish your feeds on any web site (Updated to work with 2.n.n).
# Integrated Live Bookmark import.
# Integrated email sharing of news items and/or feeds (via simple implementation of SMTP).
# Integrated domain specific Google search.
# Integrated Feedster search.
# Integrated Feedbase search.
# Integrated weather reports (Not great but it works).
# Also a fairly useful Gmail checker.
# Supports sk-SK (Slovak), fr-FR (French), ja-JP (Japanese), de-DE (German), ru-RU (Russian), da-DK (Danish) and pt-BR (Portuguese (Brazilian)), es-ES (Spanish (Spain)), el-GR (Greek), es-AR (Spanish (Argentina)), it-IT (Italian), fi-FI (Finnish), af-ZA (Afrikaans) and be-BY (Belarusian) locales.

If you use Firefox, Wizz RSS News Reader can be installed here - https://addons.mozilla.org/firefox/424/