One of the features of the add-on is the possibility to divide feeds into tabs, so you'll have them in order.
Other interesting option is the one that allows you to hide read messages, what makes the Facebook experience better, because you'll only find new messages.
You can also set Facebook toolbar always on top, even when you scroll down.
If you are hooked to Facebook, Better Facebook is the pack you need to make Facebook experience even better.
This version is for Google Chrome, although you can find versions for Opera and Safari in the official website.