linux-crash on submit form

hi
i just crashed my system twice when trying to validate a css with
http://jigsaw.w3.org/css-validator/validator-text.html

crash here means a suddenly black screen with low resulution and some
funny colored pixels, then after a few seconds i come back to my logon
screen

system is xubuntu 6 dapper, firefox 1.5.0.4
default settings in the submit form

greetz
pat

Received on Friday, 28 July 2006 12:23:27 UTC