I also get this crash sometimes.
The only evidence of the crash i can get in all log files is :
firefox-bin: Fatal IO error 10 (No child processes) on X server :0.0.
in .xsession-errors
** Changed in: firefox-3.5 (Ubuntu)
Status: Invalid => Confirmed
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firefox-3.5 crashed and terminate automatically
https://bugs.launchpad.net/bugs/366405
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