AutoPager  is an add-on available for people using Firefox as your web browser. It works well with many major sites like Google, that display multiple pages of search results by automatically loading the next page when you reach the bottom. This could be useful for quickly browsing search results without waiting for the next page to load.
Here's an example of how AutoPager works with Google Image search results. Everything above the gray bar is from the first page of results and everything below the gray bar is the second page of the search results.
Thanks for the tip Brendan!