Turn Off The Lights does exactly what it says on the tin, allowing you to quickly and easily turn off the lights when watching online video. You click the icon and everything other than the video goes dark, click it again and everything goes back to normal
Hover Zoom enlarges thumbnails when you scroll your cursor over them, thus saving you the time and trouble of opening them in new window. This is especially useful on sites such as Facebook, Twitter, Reddit, and 4chan.
Speed Dial 2 replaces what you see when you first start up Chrome, with a customizable new tab page capable of displaying your bookmarks, browsing history, and most visited pages, amongst other things.