Check out the greasemonkey script
Autopagerize adds infinite scroll functionality to hundreds of websites, including Google, Yahoo, Blogger, and Twitter. It was written by Japanese hacker swdyh with inspiration and ideas from ma.la. I strongly recommend you check it out. Naturally you’ll need the Firefox extension Greasemonkey in order for it to work.
If you’re not a greasemonkey type of person, you can install the AutoPager firefox extension.
If you’re a Safari user, install Greasekit and then use oAutoPagerize.
If you’re a Google Chrome user, install Greasemetal and then use oAutoPagerize.
If you’re an IE user, please get yourself a better browser and I’ll think about forgiving you..