Stumble Upon: Cool Feature

One of my friends told me to get stumbleupon for firefox, it's kind of like digg but you can put a toolbox on the top of your browser and from there you can "like" things, "stumble" photos or videos on the internet, send messages to friends, etc. Anyways, what's cool about it is if you find something you like on a website and you want to search it on google all you have to do is highlight it, right click, and then click "search google for.." It saves a bunch of my time as I spend a lot of time googling things I find interesting.