If you're using Google Chrome, I recommend: Google Dictionary - Double-click a word and it will give you the definition. Rottenizer - Shows you Rotten Tomatoes scores on Netflix Stay Focused - Limits the amount of time you can spend on time-wasting websites. You can block whatever sites you want for whatever amount of time you want so you can stay focused. However, you can still turn it off whenever you want... But that decision is yours. Hover Free - enlarges picture thumbnails when you hover over them. Dictionary of Numbers - This one can get kind of annoying, but it helps put numbers into perspective. For example, if someone says "$3 million," it will say "[≈ cost of 30-second Super Bowl advertisement]" right after that. I find it interesting just to see certain things. Disconnect - Loads pages faster and stops sites from tracking you.