Kill Infinite Scroll v1.0.6resigned1
This disables the infinite scroll used by Tumblr and other sites. In particular it cripples the scripts from http://www.infinite-scroll.com (version 1.4 and 2.0). Unlike the Anti Tumblr Infinite Scroll add-on, it just restores the original Next and Prev buttons.
Version 0.5 of the add-on adds the TumbleLog infinite scroller. You can also configure a file of exceptions.
Infinite scrolling on sites such as Yahoo and Google forums is not handled.