System freezes unexpectly

[Davide Italiano]

Hi.
I'm running 8.1 on my Sony Vaio laptop, with dwm as window manager on
lastest Xorg on ports.
When I'm trying to run firefox3, the system "freezes" unexpectly. I
know that "freezes" is a bit generic but I can't find a more specific
term to describe the situation. Dmesg doesn't give useful infos.

I installed firefox using pkg_add -r , the only add-on/plugin
installed is Xmarks.

I'm ready to eventually debug, any suggestion is apprectiated.

Thanks

Davide