I have been playing with a Firefox extension called ThumbStrips, this is a quite nice tool it makes screenshots of the sites you visit.
ThumbStrips makes a filmstrip of thumbnails of the web pages you visit, so that you can go back to them and see what you browsed. In other words this extension makes thumbnails for your history pages, you can exclude sites for which you don’t want to store thumbnails.
Once you install the extension it starts taking thumbshots of the pages you visit, a small icon will appear on the Navigation toolbar, you can click on that to see a slideshow of thumbstrips created. The thumbstrips appear as a frame in the bottom of the browser window, you can click on any thumbstrip to visit that web page.The created thumbnails can be saved and shared with friends.
Thumbstrips is a product of Innovation Lab. You can download the ThumbStrips extension from Mozilla site