Rated 5 out of 5 stars

by piestealer on June 14, 2012 · permalink

One of the absolute best add-ons, in my opinion. Super simple, intuitive and useful. I often forget it's an add-on, and not just a FF feature, until I'm on someone else's computer, or using another browser to check a website's compatibility, etc.

Useful for everything from research to checking out the latest funny picture your friend posted on Facebook.