Rated 3 out of 5 stars

Works well, but adjustable feed sizes would be helpful. All I want to see is the feed headline - no pictures, no additional text. That way I can fit a ton of feeds into one page.

This review is for a previous version of the add-on (2.0.3.1-signed). 

You could view only article titles by unselecting article content display:

https://addons.cdn.mozilla.net/user-media/previews/full/129/129004.png?modified=1393968990

and you could use the compact mode.