Great extension in Chrome but sucks in Firefox. Sometimes it doesn't stop playing, lots of times you can't select where to read from, like the way it can in Chrome, and other buggy stuff that doesn't exist in Chrome. The worst part is that they only give you one free voice and it's a woman's voice. In the world of equality, we should be able to be allowed a different gender's voice (a male's voice) without having to pay for it as a premium feature. It old style mentality that will eventually bite them in the butt.