Better GReader is an extension for Mozilla Firefox. Basically, it's a set of GreaseMonkey user scripts compiled to be used as a complementary add-on. With it, both the interface of the online Google feed reader and your interactions with it will improve.
The way it works is simple. All you have to do is choose the features you want to activate (something you can change at any time) and keep testing until you're happy with the way your feed reader works.
It contains features like improved visibility and an improved news aggregator, among others. For these reasons, Better GReader is a must-have add-on for anyone who uses this online service.