On windows 7 64-bit home premium and I love it. I have stumbleupon (toolbar is toggle-able), gmail checker (shows a little badge if you have a new email), IETab (for times when chrome doesn't support things yet, like the Sirius Satellite Radio Online Player), google dictionary, adblock for chrome, smoothscroll, and a couple others for screenshots and google docs. There's also basically an ultra-beta program called Chromium which allows options from google labs open-source system, like tabs on the left side. Haven't used it much, though. I was a diehard firefox guy until chrome stepped their extension game up. Now I can't remember not browsing on chrome.