This service is currently down as far as i can tell, but up until it went down, it was one of the best text summarizers available for both Firefox and Chrome. I hope they manage to get it working again!

Some of the strong features include:

* The ability to download, share, new tab and more summarized text.

* You can choose how much of a summary you want!

* This is really worth paying for but the free version is top tier as well.