Seems to be broken for me to, clicking "End" doesn't seem to do anything. Tested it in this thread and the crowdfunding thread in Roleplaying Games (just for a long thread example).

Browser: Firefox
OS: Ubuntu Mate 16.10

I clicked view source and found the following two lines:

Code:
<a href="#top" onclick="self.scrollTo(0, 0); return false;">Top</a>
					 - 
<a href="#end" onclick="scrollTo(0,document.body.clientHeight); return false;">End</a>
As a simple guess: the second line should be self.scrollTo as well.

Cheers.