I have played with it more to find a good way to reproduce it. Well,
kind of. Download crash.txt, then view in Firefox (maybe works for
Mozilla too). Be sure to save anything before you play with crash.txt,
because it will kill X.
http://people.freebsd.org/~mezz/crash.txt
To reproduce crash in Firefox:
1) Run Firefox (keep in mind, everything option is default)
2) Open crash.txt
3) Go to menu, 'View -> Character Encoding -> More Encodings ->
Unicode' and select any in there. After you selected, then do it again
but select different Unicode like more than three times. Sometime it
would crash X in two changes.