Rated 4 out of 5 stars

Great! but the extension cannot be installed with Firefox for ubuntu (14.04).

Rated 5 out of 5 stars

I signed up for an account just to review Carrot2. This is the greatest search engine ever. It actually makes the internet useful. I cannot believe the garbage that the big search engines pull up. Carrot fetches relevant and diverse information. You will not believe the difference. Enjoy!!