Gnome 3 crash with iceweasel and chromium

[José Silva <jsantossilva@hotmail.com>]

I smoothly upgraded my sid install to Gnome 3 a few days ago, when it 
became available, and now I'm experiencing crashes (goes to login 
screen) with several web pages. Sometimes it repeats with the specific 
page, sometimes not. Happens both with iceweasel and chromium, didn't 
try with epiphany.

Looked on the net a this list but couldn't find nothing recent like this.

Anybody experiencing the same?

Any fixes?

Where in the logs or how can I get some information of what's happening?

TIA,
jss