bug irony - bug in firefox or xorg

[EA Durbin]

While browsing the bug database I discovered a bug, in which my x server 
crashes when i use the side horizontal scrollbar in firefox. I was browsing 
this attachment in firefox

http://bugs.winehq.org/attachment.cgi?id=2517&action=view

Can anyone replicate this bug?, I'm not sure whether to submit this bug to 
firefox or xorg. It crashes at the same point every time, when I try to use 
the horizontal scrollbar on this page. I opened firefox in the console and 
output the text to a file, upon logging back in to x i opened this file and 
had a message saying firefox lost the x session. I don't know if the bug 
resides in firefox or X?