Rated 5 out of 5 stars
Definitely the best RSS extension for firefox!
It lets you save a lot of time because you get the latest news fast without doing something for it.
There exist two extensions with similar functionality (RSS Ticker & InfoRSS) but with the big disadvantage of causing extreme CPU load.
I have got just an objection: In Simple RSS Reader you need to add feeds manually it is not possible to import bookmarked feeds.