Piclens for Safari is an awesome plugin. You have to use it to see how good it is. Once installed, it shows up as a small rectangle at the bottom left of the photo when browsing a page of photos such as on Flickr. Click the PicLens icon and then the magic begins. The photo is displayed full screen with some floating controls at the top and the bottom that displays what the next photo in the slideshow is and one can change the images with the arrow keys. It is truly great to browse through photo sites. One can get it here.