AutoPager is a Firefox extension which follows the “Next” links on lots of pages and loads them inline. If you’re already using the extension, go to AutoPager -> Update Setting -> Update Setting Online.
The authors just added VMTN forums and NetApp Technology Network to their supported sites. This means if you’re reading a long thread you don’t have to click next. You can just keep scrolling — the next page is loaded inline.
It also works on thread lists.
This is a screenshot of the “Loading” indicator in the bottom left. Once you scroll so far, it automatically shows up, then fetches the next page.