Maybe your not a RSS feed junkie like I am, but you do like to do some occasional headline tracking from time to time. Simple RSS Reader might be the extension for you, as it does exactly what you would think. It is a simple little RSS reader (minus the geeky complications).
The hardest part about Simple RSS Reader is adding the RSS feeds. Just click on the blue RSS icon and give a name and URL to each. That is it. The thing I like most about this add-on is the fast forward, rewind, pause, stop and play options for the ticker you get at the top.
You have your headline or link at the left, your source in the middle and then your controls on the far right. An entire feed reader all in one toolbar. It also has a very small memory footprint, so if you are staying away from add-ons that eat up too much of your RAM you have no need to worry about the Simple RSS Reader. It might be the best of the RSS news ticker extensions.
You can pick it up at the official web site or the Firefox Add-ons site. Oh and if you need an RSS feed to start your collection with, I have a great one for you: http://feeds.feedburner.com/firefoxfacts (shameless plug I know…)