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Have you ever been watching log output via a web application, and you just want your browser window to jump to the bottom of the document whenever new output shows up? Well, stranger, let me tell you, I certainly have. That's why I wrote a bookmarklet that does just that.
The first time you invoke it, it sets a variable in the window that it uses to jump on an interval (1 second) and does its thing. If you invoke it again on a page where it is already active, it will cancel the interval and delete the variable, ending the scrolling behavior.
Here's the raw
You may also drag 'n drop the following link to your bookmarks toolbar: