Looks like the others don't understand or appreciate what this addon does PERFECTLY as per its description: it scrolls pages down to the end that have "javascript autofeeds" loading more content when you scroll. It does it even when you change tabs, which is PERFECT again! HUGE THANKS to the author! While I know how to achieve the same using ff developer tools, it's too much hassle. THIS ADDON makes it SO EASY. :-)

I downloaded it to auto scroll a very long facebook page. It's doing its job (for the last 15 minutes) while I write this review.

If you want to auto scroll then Scroll++ will get your job done.