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Sounds like networking to me, too. It's a sad commentary on the state of graphics hardware that we expect lockups with graphically intense applications, though, isn't it?
I'd do "service network stop" (as root) and then leave mozilla or gaim up and running for a while and see if you have any problems. You could even try working on them--have mozilla give you a whole bunch of DNS errors--and see if you lock up. That would provide anecodotal evidence that the problem is in the network support.
You might also upgrade your kernel, hopefully there will be fixed or improved support for your network chipset. Do you know what sort of NIC you've got?
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