Today Apple updated Safari and added the Extensions Gallery to their website. Download Safari through Apple update. For Mac users, you can find that in the Apple menu, click “Software Update…”. On Windows, it can be found in the Start menu > Programs. It may be in a folder in there as well. You can also find the update by downloading it from Apple’s website.
The update makes extensions enabled (if you haven’t already done so). Then, you can head over to Apple’s website to start downloading extensions. There’s plenty over there, and many look pretty useful. There were a few I haven’t seen before, like Expose, which is like Exposé for your open tabs, the official TinEye extension, and a great weather channel extension that puts weather in your toolbar. Head on over and take a look, I’m sure you’ll find a few you like.