Automatically loads the next page and inserts into current page when you reach the end of the page. like AutoPagerize.
Chrome
https://chrome.google.com/webstore/detail/aeolcjbaammbkgaiagooljfdepnjmkfd
Safari
http://ss-o.net/safari/extension/AutoPatchWork.safariextz
Opera
https://addons.opera.com/addons/extensions/details/autopatchwork/