As a way to make pages load quicker in your browser, many sites utilize a paging method (next/previous page, jump to page X, etc.). This makes sense from both a server side (decreased bandwidth usage) and the client side (increase load time), but it requires user intervention to load the next page. Firefox users who want to have this content automatically appended to the bottom of the page should check out the AutoPager add-on.
The AutoPager Firefox extension automatically loads the next page of a site inline when you reach the end of the current page for infinite scrolling of content.
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By default AutoPager works with a ton of sites, including Lifehacker, the New York Times, Digg, and, of course, Google. If you want to add your own custom autopaging to unsupported sites, the site wizard feature makes it easy (first pick the Next link, then pick only the content you want loaded. The site workshop provide more features like auto discovery the links and content.
While the add-on does work with many popular sites out of the box, if you want to add sites you frequent which do not have rules predefined you would have to add your own rules which requires a bit of XML knowledge. However, AutoPager is useful even if you were to only use it for Google searches.
This is worth giving a try.

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Maybe it helps bandwidth slightly, especially on image heavy articles. But the real reason they do that is to increase page view numbers, ads, etc…
For those wondering, they have a chrome port of the addon, although it’s in early development. It works great for most stuff, but they don’t have the “workshop”portion ported over yet, which allows you to make custom rules for unsupported sites.